diff --git a/flytecopilot/cmd/download.go b/flytecopilot/cmd/download.go
index 3827308c335..42b1f8d9cde 100644
--- a/flytecopilot/cmd/download.go
+++ b/flytecopilot/cmd/download.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/golang/protobuf/proto"
 	"github.com/spf13/cobra"
 
 	"github.com/flyteorg/flyte/flytecopilot/data"
@@ -49,6 +50,11 @@ func GetUploadModeVals() []string {
 }
 
 func (d *DownloadOptions) Download(ctx context.Context) error {
+	inputInterface := &core.VariableMap{}
+	if err := proto.Unmarshal(d.inputInterface, inputInterface); err != nil {
+		logger.Warnf(ctx, "Bad input interface passed, failed to unmarshal err: %s", err)
+	}
+
 	if d.remoteOutputsPrefix == "" {
 		return fmt.Errorf("to-output-prefix is required")
 	}
@@ -77,7 +83,7 @@ func (d *DownloadOptions) Download(ctx context.Context) error {
 			childCtx, cancelFn = context.WithTimeout(ctx, d.timeout)
 		}
 		defer cancelFn()
-		err := dl.DownloadInputs(childCtx, storage.DataReference(d.remoteInputsPath), d.localDirectoryPath)
+		err := dl.DownloadInputs(childCtx, inputInterface, storage.DataReference(d.remoteInputsPath), d.localDirectoryPath)
 		if err != nil {
 			logger.Errorf(ctx, "Downloading failed, err %s", err)
 			return err
@@ -116,6 +122,6 @@ func NewDownloadCommand(opts *RootOptions) *cobra.Command {
 	downloadCmd.Flags().StringVarP(&downloadOpts.metadataFormat, "format", "m", core.DataLoadingConfig_JSON.String(), fmt.Sprintf("What should be the output format for the primitive and structured types. Options [%v]", GetFormatVals()))
 	downloadCmd.Flags().StringVarP(&downloadOpts.downloadMode, "download-mode", "d", core.IOStrategy_DOWNLOAD_EAGER.String(), fmt.Sprintf("Download mode to use. Options [%v]", GetDownloadModeVals()))
 	downloadCmd.Flags().DurationVarP(&downloadOpts.timeout, "timeout", "t", time.Hour*1, "Max time to allow for downloads to complete, default is 1H")
-	downloadCmd.Flags().BytesBase64VarP(&downloadOpts.inputInterface, "input-interface", "i", nil, "Input interface proto message - core.VariableMap, base64 encoced string")
+	downloadCmd.Flags().BytesBase64VarP(&downloadOpts.inputInterface, "input-interface", "i", nil, "Input interface proto message - core.VariableMap, base64 encoded string")
 	return downloadCmd
 }
diff --git a/flytecopilot/cmd/download_test.go b/flytecopilot/cmd/download_test.go
index b96ffd46a60..f9e2c436c2f 100644
--- a/flytecopilot/cmd/download_test.go
+++ b/flytecopilot/cmd/download_test.go
@@ -10,6 +10,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/golang/protobuf/proto"
 	"github.com/stretchr/testify/assert"
 
 	"github.com/flyteorg/flyte/flyteidl/clients/go/coreutils"
@@ -137,6 +138,83 @@ func TestDownloadOptions_Download(t *testing.T) {
 		assert.ElementsMatch(t, []string{"inputs.json", "inputs.pb", "x", "y", "blob"}, collectFile(tmpDir))
 	})
 
+	t.Run("primitiveAndBlobInputsWithFileExtension", func(t *testing.T) {
+		tmpDir, err := ioutil.TempDir(tmpFolderLocation, tmpPrefix)
+		assert.NoError(t, err)
+		defer func() {
+			assert.NoError(t, os.RemoveAll(tmpDir))
+		}()
+		dopts.localDirectoryPath = tmpDir
+
+		s := promutils.NewTestScope()
+		store, err := storage.NewDataStore(&storage.Config{Type: storage.TypeMemory}, s.NewSubScope("storage"))
+		assert.NoError(t, err)
+		dopts.RootOptions = &RootOptions{
+			Scope: s,
+			Store: store,
+		}
+
+		iface := &core.VariableMap{
+			Variables: map[string]*core.Variable{
+				"blob": {
+					Type: &core.LiteralType{Type: &core.LiteralType_Blob{Blob: &core.BlobType{Dimensionality: core.BlobType_SINGLE, Format: "xyz", FileExtension: "xyz", EnableLegacyFilename: false}}},
+				},
+				"legacy_blob": {
+					Type: &core.LiteralType{Type: &core.LiteralType_Blob{Blob: &core.BlobType{Dimensionality: core.BlobType_SINGLE, Format: "xyz", FileExtension: "xyz", EnableLegacyFilename: true}}},
+				},
+			},
+		}
+		d, err := proto.Marshal(iface)
+		assert.NoError(t, err)
+		dopts.inputInterface = d
+
+		blobLoc := storage.DataReference("blob-loc")
+		br := bytes.NewBuffer([]byte("Hello World!"))
+		assert.NoError(t, store.WriteRaw(ctx, blobLoc, int64(br.Len()), storage.Options{}, br))
+		assert.NoError(t, store.WriteProtobuf(ctx, storage.DataReference(inputPath), storage.Options{}, &core.LiteralMap{
+			Literals: map[string]*core.Literal{
+				"x": coreutils.MustMakePrimitiveLiteral(1),
+				"y": coreutils.MustMakePrimitiveLiteral("hello"),
+				"blob": {Value: &core.Literal_Scalar{
+					Scalar: &core.Scalar{
+						Value: &core.Scalar_Blob{
+							Blob: &core.Blob{
+								Uri: blobLoc.String(),
+								Metadata: &core.BlobMetadata{
+									Type: &core.BlobType{
+										Dimensionality:       core.BlobType_SINGLE,
+										Format:               "xyz",
+										FileExtension:        "xyz",
+										EnableLegacyFilename: false,
+									},
+								},
+							},
+						},
+					},
+				}},
+				"legacy_blob": {Value: &core.Literal_Scalar{
+					Scalar: &core.Scalar{
+						Value: &core.Scalar_Blob{
+							Blob: &core.Blob{
+								Uri: blobLoc.String(),
+								Metadata: &core.BlobMetadata{
+									Type: &core.BlobType{
+										Dimensionality:       core.BlobType_SINGLE,
+										Format:               "xyz",
+										FileExtension:        "xyz",
+										EnableLegacyFilename: true,
+									},
+								},
+							},
+						},
+					},
+				}},
+			},
+		}))
+		assert.NoError(t, dopts.Download(ctx), "Download Operation failed")
+		assert.ElementsMatch(t, []string{"inputs.json", "inputs.pb", "x", "y", "blob.xyz", "legacy_blob", "legacy_blob.xyz"}, collectFile(tmpDir))
+	})
+
 	t.Run("primitiveAndMissingBlobInputs", func(t *testing.T) {
 		tmpDir, err := ioutil.TempDir(tmpFolderLocation, tmpPrefix)
 		assert.NoError(t, err)
diff --git a/flytecopilot/data/download.go b/flytecopilot/data/download.go
index 084469faed2..effb63686ff 100644
--- a/flytecopilot/data/download.go
+++ b/flytecopilot/data/download.go
@@ -33,6 +33,39 @@ type Downloader struct {
 	mode core.IOStrategy_DownloadMode
 }
 
+// By default, blobs (FlyteFiles) were not and still are not written with a file extension.
+// For example, a data: FlyteFile["csv"] blob should be written to "data", even though
+// Format="csv".
+//
+// When FileExtension="" (the default), this old behavior is preserved.
+//
+// However, a data: Annotated[FlyteFile["csv"], FileDownloadConfig(file_extension="csv")]
+// blob should be written to "data.csv" - both Format="csv" and FileExtension="csv" (new behavior).
+//
+// So when e.g. FileExtension="csv", the file is written to "data.csv".
+// Also, when e.g. FileExtension="csv" and EnableLegacyFilename=true, the file is written to
+// "data" and "data.csv" (partially new behavior, bridges the gap of backward compatibility).
+func resolveVarFilenames(vars *core.VariableMap) map[string][]string {
+	varFilenames := make(map[string][]string, len(vars.GetVariables()))
+	for varName, variable := range vars.GetVariables() {
+		varType := variable.GetType()
+		switch varType.GetType().(type) {
+		case *core.LiteralType_Blob:
+			if varType.GetBlob().GetFileExtension() == "" {
+				varFilenames[varName] = append(varFilenames[varName], varName)
+			} else {
+				varFilenames[varName] = append(varFilenames[varName], varName+"."+varType.GetBlob().GetFileExtension())
+				if varType.GetBlob().GetEnableLegacyFilename() {
+					varFilenames[varName] = append(varFilenames[varName], varName)
+				}
+			}
+		default:
+			varFilenames[varName] = append(varFilenames[varName], varName)
+		}
+	}
+	return varFilenames
+}
+
 // TODO add timeout and rate limit
 // TODO use chunk to download
 func (d Downloader) handleBlob(ctx context.Context, blob *core.Blob, toPath string) (interface{}, error) {
@@ -432,7 +465,7 @@ func (d Downloader) handleLiteral(ctx context.Context, lit *core.Literal, filePa
 		if err != nil {
 			return nil, nil, errors.Wrapf(err, "failed to create directory [%s]", filePath)
 		}
-		v, m, err := d.RecursiveDownload(ctx, lit.GetMap(), filePath, writeToFile)
+		v, m, err := d.RecursiveDownload(ctx, lit.GetMap(), filePath, make(map[string][]string), writeToFile)
 		if err != nil {
 			return nil, nil, err
 		}
@@ -468,7 +501,7 @@ type downloadedResult struct {
 	v   interface{}
 }
 
-func (d Downloader) RecursiveDownload(ctx context.Context, inputs *core.LiteralMap, dir string, writePrimitiveToFile bool) (VarMap, *core.LiteralMap, error) {
+func (d Downloader) RecursiveDownload(ctx context.Context, inputs *core.LiteralMap, dir string, varFilenames map[string][]string, writePrimitiveToFile bool) (VarMap, *core.LiteralMap, error) {
 	childCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
 	if inputs == nil || len(inputs.GetLiterals()) == 0 {
@@ -486,14 +519,26 @@ func (d Downloader) RecursiveDownload(ctx context.Context, inputs *core.LiteralM
 			}
 			logger.Infof(ctx, "read object at location [%s]", offloadedMetadataURI)
 		}
-		varPath := path.Join(dir, variable)
 		lit := literal
 		f[variable] = futures.NewAsyncFuture(childCtx, func(ctx2 context.Context) (interface{}, error) {
-			v, lit, err := d.handleLiteral(ctx2, lit, varPath, writePrimitiveToFile)
-			if err != nil {
-				return nil, err
+			var filenames []string
+			var resultLit *core.Literal
+			var resultV interface{}
+			var err error
+			if len(varFilenames[variable]) == 0 {
+				filenames = []string{variable}
+			} else {
+				filenames = varFilenames[variable]
+			}
+			for _, filename := range filenames {
+				varPath := path.Join(dir, filename)
+				// TODO: Refactor handleLiteral to accept a list of file paths and return a list of downloaded results
+				resultV, resultLit, err = d.handleLiteral(ctx2, lit, varPath, writePrimitiveToFile)
+				if err != nil {
+					return nil, err
+				}
 			}
-			return downloadedResult{lit: lit, v: v}, nil
+			return downloadedResult{lit: resultLit, v: resultV}, nil
 		})
 	}
 
@@ -520,7 +565,7 @@ func (d Downloader) RecursiveDownload(ctx context.Context, inputs *core.LiteralM
 	return vmap, m, nil
 }
 
-func (d Downloader) DownloadInputs(ctx context.Context, inputRef storage.DataReference, outputDir string) error {
+func (d Downloader) DownloadInputs(ctx context.Context, vars *core.VariableMap, inputRef storage.DataReference, outputDir string) error {
 	logger.Infof(ctx, "Downloading inputs from [%s]", inputRef)
 	defer logger.Infof(ctx, "Exited downloading inputs from [%s]", inputRef)
 	if err := os.MkdirAll(outputDir, os.ModePerm); err != nil {
@@ -533,7 +578,9 @@ func (d Downloader) DownloadInputs(ctx context.Context, inputRef storage.DataRef
 		logger.Errorf(ctx, "Failed to download inputs from [%s], err [%s]", inputRef, err)
 		return errors.Wrapf(err, "failed to download input metadata message from remote store")
 	}
-	varMap, lMap, err := d.RecursiveDownload(ctx, inputs, outputDir, true)
+
+	varFilenames := resolveVarFilenames(vars)
+	varMap, lMap, err := d.RecursiveDownload(ctx, inputs, outputDir, varFilenames, true)
 	if err != nil {
 		return errors.Wrapf(err, "failed to download input variable from remote store")
 	}
diff --git a/flytecopilot/data/download_test.go b/flytecopilot/data/download_test.go
index 1da5602e2c9..df38fdb0c82 100644
--- a/flytecopilot/data/download_test.go
+++ b/flytecopilot/data/download_test.go
@@ -231,7 +231,7 @@ func TestRecursiveDownload(t *testing.T) {
 			}
 		}()
 
-		varMap, lMap, err := d.RecursiveDownload(context.Background(), inputs, toPath, true)
+		varMap, lMap, err := d.RecursiveDownload(context.Background(), inputs, toPath, map[string][]string{}, true)
 		assert.NoError(t, err)
 		assert.NotNil(t, varMap)
 		assert.NotNil(t, lMap)
@@ -309,7 +309,7 @@ func TestRecursiveDownload(t *testing.T) {
 			}
 		}()
 
-		varMap, lMap, err := d.RecursiveDownload(context.Background(), inputs, toPath, true)
+		varMap, lMap, err := d.RecursiveDownload(context.Background(), inputs, toPath, map[string][]string{}, true)
 		assert.NoError(t, err)
 		assert.NotNil(t, varMap)
 		assert.NotNil(t, lMap)
diff --git a/flytecopilot/data/upload.go b/flytecopilot/data/upload.go
index 2103028d287..6c8e3600683 100644
--- a/flytecopilot/data/upload.go
+++ b/flytecopilot/data/upload.go
@@ -107,11 +107,11 @@ func (u Uploader) handleBlobType(ctx context.Context, localPath string, toPath s
 			}
 		}
 
-		return coreutils.MakeLiteralForBlob(toPath, false, ""), nil
+		return coreutils.MakeLiteralForBlob(toPath, false, "", "", false), nil
 	}
 	size := info.Size()
 	// Should we make this a go routine as well, so that we can introduce timeouts
-	return coreutils.MakeLiteralForBlob(toPath, false, ""), UploadFileToStorage(ctx, fpath, toPath, size, u.store)
+	return coreutils.MakeLiteralForBlob(toPath, false, "", "", false), UploadFileToStorage(ctx, fpath, toPath, size, u.store)
 }
 
 func (u Uploader) RecursiveUpload(ctx context.Context, vars *core.VariableMap, fromPath string, metaOutputPath, dataRawPath storage.DataReference) error {
diff --git a/flyteidl/.gitignore b/flyteidl/.gitignore
index f7a920620fd..a666666dbbc 100644
--- a/flyteidl/.gitignore
+++ b/flyteidl/.gitignore
@@ -8,6 +8,9 @@ vendor
 
 dist
 gen/pb_python/flyteidl.egg-info/
+gen/pb_python/flyteidl/**/__pycache__/
+pip-wheel-metadata/*.dist-info/
+*.egg-info/
 
 .virtualgo
 docs/build/
diff --git a/flyteidl/clients/go/assets/admin.swagger.json b/flyteidl/clients/go/assets/admin.swagger.json
index 6e3aa65f81c..e8c0f7dd5b3 100644
--- a/flyteidl/clients/go/assets/admin.swagger.json
+++ b/flyteidl/clients/go/assets/admin.swagger.json
@@ -6857,6 +6857,14 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") to use during copilot download.\nDefault is \"\", which means no extension is appended.\nDifferences from \"format\":\n  1. \"format\" is used for type validation in flytekit, \"file_extension\" is not.\n  2. \"file_extension\" controls the file extension of the blob when materializing\n   to local disk during copilot download, unlike \"format\"."
+        },
+        "enable_legacy_filename": {
+          "type": "boolean",
+          "description": "When true and file_extension is non-empty, the copilot download phase\nwrites the blob to both the full path (with extension) and the\nold path (without extension), preserving backward compatibility for\nworkflows with tasks that may read from both. Default is false."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/clients/go/coreutils/literals.go b/flyteidl/clients/go/coreutils/literals.go
index 310e389c733..0874d3c015b 100644
--- a/flyteidl/clients/go/coreutils/literals.go
+++ b/flyteidl/clients/go/coreutils/literals.go
@@ -485,7 +485,7 @@ func MakeLiteralForStructuredDataSet(path storage.DataReference, columns []*core
 	}
 }
 
-func MakeLiteralForBlob(path storage.DataReference, isDir bool, format string) *core.Literal {
+func MakeLiteralForBlob(path storage.DataReference, isDir bool, format string, fileExtension string, enableLegacyFilename bool) *core.Literal {
 	dim := core.BlobType_SINGLE
 	if isDir {
 		dim = core.BlobType_MULTIPART
@@ -498,8 +498,10 @@ func MakeLiteralForBlob(path storage.DataReference, isDir bool, format string) *
 						Uri: path.String(),
 						Metadata: &core.BlobMetadata{
 							Type: &core.BlobType{
-								Dimensionality: dim,
-								Format:         format,
+								Dimensionality:       dim,
+								Format:               format,
+								FileExtension:        fileExtension,
+								EnableLegacyFilename: enableLegacyFilename,
 							},
 						},
 					},
@@ -601,7 +603,7 @@ func MakeLiteralForType(t *core.LiteralType, v interface{}) (*core.Literal, erro
 
 	case *core.LiteralType_Blob:
 		isDir := newT.Blob.GetDimensionality() == core.BlobType_MULTIPART
-		lv := MakeLiteralForBlob(storage.DataReference(fmt.Sprintf("%v", v)), isDir, newT.Blob.GetFormat())
+		lv := MakeLiteralForBlob(storage.DataReference(fmt.Sprintf("%v", v)), isDir, newT.Blob.GetFormat(), newT.Blob.GetFileExtension(), newT.Blob.GetEnableLegacyFilename())
 		return lv, nil
 
 	case *core.LiteralType_Schema:
diff --git a/flyteidl/clients/go/coreutils/literals_test.go b/flyteidl/clients/go/coreutils/literals_test.go
index 3586e0e02fc..9d5967da9b0 100644
--- a/flyteidl/clients/go/coreutils/literals_test.go
+++ b/flyteidl/clients/go/coreutils/literals_test.go
@@ -388,9 +388,11 @@ func TestMakeLiteralForSimpleType(t *testing.T) {
 
 func TestMakeLiteralForBlob(t *testing.T) {
 	type args struct {
-		path   storage.DataReference
-		isDir  bool
-		format string
+		path                 storage.DataReference
+		isDir                bool
+		format               string
+		fileExtension        string
+		enableLegacyFilename bool
 	}
 	tests := []struct {
 		name string
@@ -399,10 +401,12 @@ func TestMakeLiteralForBlob(t *testing.T) {
 	}{
 		{"simple-key", args{path: "/key", isDir: false, format: "xyz"}, &core.Blob{Uri: "/key", Metadata: &core.BlobMetadata{Type: &core.BlobType{Format: "xyz", Dimensionality: core.BlobType_SINGLE}}}},
 		{"simple-dir", args{path: "/key", isDir: true, format: "xyz"}, &core.Blob{Uri: "/key", Metadata: &core.BlobMetadata{Type: &core.BlobType{Format: "xyz", Dimensionality: core.BlobType_MULTIPART}}}},
+		{"simple-key-with-extension", args{path: "/key", isDir: false, format: "xyz", fileExtension: "xyz", enableLegacyFilename: false}, &core.Blob{Uri: "/key", Metadata: &core.BlobMetadata{Type: &core.BlobType{Format: "xyz", Dimensionality: core.BlobType_SINGLE, FileExtension: "xyz", EnableLegacyFilename: false}}}},
+		{"simple-key-with-extension-and-legacy-filename", args{path: "/key", isDir: false, format: "xyz", fileExtension: "xyz", enableLegacyFilename: true}, &core.Blob{Uri: "/key", Metadata: &core.BlobMetadata{Type: &core.BlobType{Format: "xyz", Dimensionality: core.BlobType_SINGLE, FileExtension: "xyz", EnableLegacyFilename: true}}}},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if got := MakeLiteralForBlob(tt.args.path, tt.args.isDir, tt.args.format); !reflect.DeepEqual(got.GetScalar().GetBlob(), tt.want) {
+			if got := MakeLiteralForBlob(tt.args.path, tt.args.isDir, tt.args.format, tt.args.fileExtension, tt.args.enableLegacyFilename); !reflect.DeepEqual(got.GetScalar().GetBlob(), tt.want) {
 				t.Errorf("MakeLiteralForBlob() = %v, want %v", got, tt.want)
 			}
 		})
diff --git a/flyteidl/gen/pb-es/flyteidl/core/types_pb.ts b/flyteidl/gen/pb-es/flyteidl/core/types_pb.ts
index f311fa0692b..5b0344c65b2 100644
--- a/flyteidl/gen/pb-es/flyteidl/core/types_pb.ts
+++ b/flyteidl/gen/pb-es/flyteidl/core/types_pb.ts
@@ -341,6 +341,28 @@ export class BlobType extends Message<BlobType> {
    */
   dimensionality = BlobType_BlobDimensionality.SINGLE;
 
+  /**
+   * Optional file extension (e.g. "csv", "parquet") to use during copilot download.
+   * Default is "", which means no extension is appended.
+   * Differences from "format":
+   *   1. "format" is used for type validation in flytekit, "file_extension" is not.
+   *   2. "file_extension" controls the file extension of the blob when materializing
+   *    to local disk during copilot download, unlike "format".
+   *
+   * @generated from field: string file_extension = 3;
+   */
+  fileExtension = "";
+
+  /**
+   * When true and file_extension is non-empty, the copilot download phase
+   * writes the blob to both the full path (with extension) and the
+   * old path (without extension), preserving backward compatibility for
+   * workflows with tasks that may read from both. Default is false.
+   *
+   * @generated from field: bool enable_legacy_filename = 4;
+   */
+  enableLegacyFilename = false;
+
   constructor(data?: PartialMessage<BlobType>) {
     super();
     proto3.util.initPartial(data, this);
@@ -351,6 +373,8 @@ export class BlobType extends Message<BlobType> {
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
     { no: 1, name: "format", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 2, name: "dimensionality", kind: "enum", T: proto3.getEnumType(BlobType_BlobDimensionality) },
+    { no: 3, name: "file_extension", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 4, name: "enable_legacy_filename", kind: "scalar", T: 8 /* ScalarType.BOOL */ },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): BlobType {
diff --git a/flyteidl/gen/pb-go/flyteidl/core/types.pb.go b/flyteidl/gen/pb-go/flyteidl/core/types.pb.go
index b844e951c93..8563add7080 100644
--- a/flyteidl/gen/pb-go/flyteidl/core/types.pb.go
+++ b/flyteidl/gen/pb-go/flyteidl/core/types.pb.go
@@ -334,6 +334,18 @@ type BlobType struct {
 	// csv, parquet etc
 	Format         string                      `protobuf:"bytes,1,opt,name=format,proto3" json:"format,omitempty"`
 	Dimensionality BlobType_BlobDimensionality `protobuf:"varint,2,opt,name=dimensionality,proto3,enum=flyteidl.core.BlobType_BlobDimensionality" json:"dimensionality,omitempty"`
+	// Optional file extension (e.g. "csv", "parquet") to use during copilot download.
+	// Default is "", which means no extension is appended.
+	// Differences from "format":
+	//  1. "format" is used for type validation in flytekit, "file_extension" is not.
+	//  2. "file_extension" controls the file extension of the blob when materializing
+	//     to local disk during copilot download, unlike "format".
+	FileExtension string `protobuf:"bytes,3,opt,name=file_extension,json=fileExtension,proto3" json:"file_extension,omitempty"`
+	// When true and file_extension is non-empty, the copilot download phase
+	// writes the blob to both the full path (with extension) and the
+	// old path (without extension), preserving backward compatibility for
+	// workflows with tasks that may read from both. Default is false.
+	EnableLegacyFilename bool `protobuf:"varint,4,opt,name=enable_legacy_filename,json=enableLegacyFilename,proto3" json:"enable_legacy_filename,omitempty"`
 }
 
 func (x *BlobType) Reset() {
@@ -382,6 +394,20 @@ func (x *BlobType) GetDimensionality() BlobType_BlobDimensionality {
 	return BlobType_SINGLE
 }
 
+func (x *BlobType) GetFileExtension() string {
+	if x != nil {
+		return x.FileExtension
+	}
+	return ""
+}
+
+func (x *BlobType) GetEnableLegacyFilename() bool {
+	if x != nil {
+		return x.EnableLegacyFilename
+	}
+	return false
+}
+
 // Enables declaring enum types, with predefined string values
 // For len(values) > 0, the first value in the ordered list is regarded as the default value. If you wish
 // To provide no defaults, make the first value as undefined.
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+	0x0b, 0x0a, 0x07, 0x42, 0x4f, 0x4f, 0x4c, 0x45, 0x41, 0x4e, 0x10, 0x04, 0x12, 0x0c, 0x0a, 0x08,
+	0x44, 0x41, 0x54, 0x45, 0x54, 0x49, 0x4d, 0x45, 0x10, 0x05, 0x12, 0x0c, 0x0a, 0x08, 0x44, 0x55,
+	0x52, 0x41, 0x54, 0x49, 0x4f, 0x4e, 0x10, 0x06, 0x12, 0x0a, 0x0a, 0x06, 0x42, 0x49, 0x4e, 0x41,
+	0x52, 0x59, 0x10, 0x07, 0x12, 0x09, 0x0a, 0x05, 0x45, 0x52, 0x52, 0x4f, 0x52, 0x10, 0x08, 0x12,
+	0x0a, 0x0a, 0x06, 0x53, 0x54, 0x52, 0x55, 0x43, 0x54, 0x10, 0x09, 0x42, 0xb0, 0x01, 0x0a, 0x11,
+	0x63, 0x6f, 0x6d, 0x2e, 0x66, 0x6c, 0x79, 0x74, 0x65, 0x69, 0x64, 0x6c, 0x2e, 0x63, 0x6f, 0x72,
+	0x65, 0x42, 0x0a, 0x54, 0x79, 0x70, 0x65, 0x73, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a,
+	0x3a, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x66, 0x6c, 0x79, 0x74,
+	0x65, 0x6f, 0x72, 0x67, 0x2f, 0x66, 0x6c, 0x79, 0x74, 0x65, 0x2f, 0x66, 0x6c, 0x79, 0x74, 0x65,
+	0x69, 0x64, 0x6c, 0x2f, 0x67, 0x65, 0x6e, 0x2f, 0x70, 0x62, 0x2d, 0x67, 0x6f, 0x2f, 0x66, 0x6c,
+	0x79, 0x74, 0x65, 0x69, 0x64, 0x6c, 0x2f, 0x63, 0x6f, 0x72, 0x65, 0xa2, 0x02, 0x03, 0x46, 0x43,
+	0x58, 0xaa, 0x02, 0x0d, 0x46, 0x6c, 0x79, 0x74, 0x65, 0x69, 0x64, 0x6c, 0x2e, 0x43, 0x6f, 0x72,
+	0x65, 0xca, 0x02, 0x0d, 0x46, 0x6c, 0x79, 0x74, 0x65, 0x69, 0x64, 0x6c, 0x5c, 0x43, 0x6f, 0x72,
+	0x65, 0xe2, 0x02, 0x19, 0x46, 0x6c, 0x79, 0x74, 0x65, 0x69, 0x64, 0x6c, 0x5c, 0x43, 0x6f, 0x72,
+	0x65, 0x5c, 0x47, 0x50, 0x42, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0xea, 0x02, 0x0e,
+	0x46, 0x6c, 0x79, 0x74, 0x65, 0x69, 0x64, 0x6c, 0x3a, 0x3a, 0x43, 0x6f, 0x72, 0x65, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/cacheservice/cacheservice.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/cacheservice/cacheservice.swagger.json
index 204e9e71223..ccd899c1966 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/cacheservice/cacheservice.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/cacheservice/cacheservice.swagger.json
@@ -156,6 +156,14 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") to use during copilot download.\nDefault is \"\", which means no extension is appended.\nDifferences from \"format\":\n  1. \"format\" is used for type validation in flytekit, \"file_extension\" is not.\n  2. \"file_extension\" controls the file extension of the blob when materializing\n   to local disk during copilot download, unlike \"format\"."
+        },
+        "enable_legacy_filename": {
+          "type": "boolean",
+          "description": "When true and file_extension is non-empty, the copilot download phase\nwrites the blob to both the full path (with extension) and the\nold path (without extension), preserving backward compatibility for\nworkflows with tasks that may read from both. Default is false."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/datacatalog/datacatalog.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/datacatalog/datacatalog.swagger.json
index 990cc1ec4ae..d870ad8d8dc 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/datacatalog/datacatalog.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/datacatalog/datacatalog.swagger.json
@@ -130,6 +130,14 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") to use during copilot download.\nDefault is \"\", which means no extension is appended.\nDifferences from \"format\":\n  1. \"format\" is used for type validation in flytekit, \"file_extension\" is not.\n  2. \"file_extension\" controls the file extension of the blob when materializing\n   to local disk during copilot download, unlike \"format\"."
+        },
+        "enable_legacy_filename": {
+          "type": "boolean",
+          "description": "When true and file_extension is non-empty, the copilot download phase\nwrites the blob to both the full path (with extension) and the\nold path (without extension), preserving backward compatibility for\nworkflows with tasks that may read from both. Default is false."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/service/admin.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/service/admin.swagger.json
index 6e3aa65f81c..e8c0f7dd5b3 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/service/admin.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/service/admin.swagger.json
@@ -6857,6 +6857,14 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") to use during copilot download.\nDefault is \"\", which means no extension is appended.\nDifferences from \"format\":\n  1. \"format\" is used for type validation in flytekit, \"file_extension\" is not.\n  2. \"file_extension\" controls the file extension of the blob when materializing\n   to local disk during copilot download, unlike \"format\"."
+        },
+        "enable_legacy_filename": {
+          "type": "boolean",
+          "description": "When true and file_extension is non-empty, the copilot download phase\nwrites the blob to both the full path (with extension) and the\nold path (without extension), preserving backward compatibility for\nworkflows with tasks that may read from both. Default is false."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/service/agent.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/service/agent.swagger.json
index 7752341446a..f7484cce141 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/service/agent.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/service/agent.swagger.json
@@ -1024,6 +1024,14 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") to use during copilot download.\nDefault is \"\", which means no extension is appended.\nDifferences from \"format\":\n  1. \"format\" is used for type validation in flytekit, \"file_extension\" is not.\n  2. \"file_extension\" controls the file extension of the blob when materializing\n   to local disk during copilot download, unlike \"format\"."
+        },
+        "enable_legacy_filename": {
+          "type": "boolean",
+          "description": "When true and file_extension is non-empty, the copilot download phase\nwrites the blob to both the full path (with extension) and the\nold path (without extension), preserving backward compatibility for\nworkflows with tasks that may read from both. Default is false."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/service/dataproxy.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/service/dataproxy.swagger.json
index 20f32b743d0..1c39db41cd9 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/service/dataproxy.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/service/dataproxy.swagger.json
@@ -246,6 +246,14 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") to use during copilot download.\nDefault is \"\", which means no extension is appended.\nDifferences from \"format\":\n  1. \"format\" is used for type validation in flytekit, \"file_extension\" is not.\n  2. \"file_extension\" controls the file extension of the blob when materializing\n   to local disk during copilot download, unlike \"format\"."
+        },
+        "enable_legacy_filename": {
+          "type": "boolean",
+          "description": "When true and file_extension is non-empty, the copilot download phase\nwrites the blob to both the full path (with extension) and the\nold path (without extension), preserving backward compatibility for\nworkflows with tasks that may read from both. Default is false."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/service/external_plugin_service.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/service/external_plugin_service.swagger.json
index 468030f76d2..0c6616f0b72 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/service/external_plugin_service.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/service/external_plugin_service.swagger.json
@@ -272,6 +272,14 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") to use during copilot download.\nDefault is \"\", which means no extension is appended.\nDifferences from \"format\":\n  1. \"format\" is used for type validation in flytekit, \"file_extension\" is not.\n  2. \"file_extension\" controls the file extension of the blob when materializing\n   to local disk during copilot download, unlike \"format\"."
+        },
+        "enable_legacy_filename": {
+          "type": "boolean",
+          "description": "When true and file_extension is non-empty, the copilot download phase\nwrites the blob to both the full path (with extension) and the\nold path (without extension), preserving backward compatibility for\nworkflows with tasks that may read from both. Default is false."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/service/signal.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/service/signal.swagger.json
index 841cb04f267..4ec586f89c2 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/service/signal.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/service/signal.swagger.json
@@ -322,6 +322,14 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") to use during copilot download.\nDefault is \"\", which means no extension is appended.\nDifferences from \"format\":\n  1. \"format\" is used for type validation in flytekit, \"file_extension\" is not.\n  2. \"file_extension\" controls the file extension of the blob when materializing\n   to local disk during copilot download, unlike \"format\"."
+        },
+        "enable_legacy_filename": {
+          "type": "boolean",
+          "description": "When true and file_extension is non-empty, the copilot download phase\nwrites the blob to both the full path (with extension) and the\nold path (without extension), preserving backward compatibility for\nworkflows with tasks that may read from both. Default is false."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-js/flyteidl.d.ts b/flyteidl/gen/pb-js/flyteidl.d.ts
index d42bc601f07..d268bd5e4f2 100644
--- a/flyteidl/gen/pb-js/flyteidl.d.ts
+++ b/flyteidl/gen/pb-js/flyteidl.d.ts
@@ -2174,6 +2174,12 @@ export namespace flyteidl {
 
             /** BlobType dimensionality */
             dimensionality?: (flyteidl.core.BlobType.BlobDimensionality|null);
+
+            /** BlobType fileExtension */
+            fileExtension?: (string|null);
+
+            /** BlobType enableLegacyFilename */
+            enableLegacyFilename?: (boolean|null);
         }
 
         /** Represents a BlobType. */
@@ -2191,6 +2197,12 @@ export namespace flyteidl {
             /** BlobType dimensionality. */
             public dimensionality: flyteidl.core.BlobType.BlobDimensionality;
 
+            /** BlobType fileExtension. */
+            public fileExtension: string;
+
+            /** BlobType enableLegacyFilename. */
+            public enableLegacyFilename: boolean;
+
             /**
              * Creates a new BlobType instance using the specified properties.
              * @param [properties] Properties to set
diff --git a/flyteidl/gen/pb-js/flyteidl.js b/flyteidl/gen/pb-js/flyteidl.js
index 7e35168f471..eb13bb0da02 100644
--- a/flyteidl/gen/pb-js/flyteidl.js
+++ b/flyteidl/gen/pb-js/flyteidl.js
@@ -5147,6 +5147,8 @@
                  * @interface IBlobType
                  * @property {string|null} [format] BlobType format
                  * @property {flyteidl.core.BlobType.BlobDimensionality|null} [dimensionality] BlobType dimensionality
+                 * @property {string|null} [fileExtension] BlobType fileExtension
+                 * @property {boolean|null} [enableLegacyFilename] BlobType enableLegacyFilename
                  */
     
                 /**
@@ -5180,6 +5182,22 @@
                  */
                 BlobType.prototype.dimensionality = 0;
     
+                /**
+                 * BlobType fileExtension.
+                 * @member {string} fileExtension
+                 * @memberof flyteidl.core.BlobType
+                 * @instance
+                 */
+                BlobType.prototype.fileExtension = "";
+    
+                /**
+                 * BlobType enableLegacyFilename.
+                 * @member {boolean} enableLegacyFilename
+                 * @memberof flyteidl.core.BlobType
+                 * @instance
+                 */
+                BlobType.prototype.enableLegacyFilename = false;
+    
                 /**
                  * Creates a new BlobType instance using the specified properties.
                  * @function create
@@ -5208,6 +5226,10 @@
                         writer.uint32(/* id 1, wireType 2 =*/10).string(message.format);
                     if (message.dimensionality != null && message.hasOwnProperty("dimensionality"))
                         writer.uint32(/* id 2, wireType 0 =*/16).int32(message.dimensionality);
+                    if (message.fileExtension != null && message.hasOwnProperty("fileExtension"))
+                        writer.uint32(/* id 3, wireType 2 =*/26).string(message.fileExtension);
+                    if (message.enableLegacyFilename != null && message.hasOwnProperty("enableLegacyFilename"))
+                        writer.uint32(/* id 4, wireType 0 =*/32).bool(message.enableLegacyFilename);
                     return writer;
                 };
     
@@ -5235,6 +5257,12 @@
                         case 2:
                             message.dimensionality = reader.int32();
                             break;
+                        case 3:
+                            message.fileExtension = reader.string();
+                            break;
+                        case 4:
+                            message.enableLegacyFilename = reader.bool();
+                            break;
                         default:
                             reader.skipType(tag & 7);
                             break;
@@ -5265,6 +5293,12 @@
                         case 1:
                             break;
                         }
+                    if (message.fileExtension != null && message.hasOwnProperty("fileExtension"))
+                        if (!$util.isString(message.fileExtension))
+                            return "fileExtension: string expected";
+                    if (message.enableLegacyFilename != null && message.hasOwnProperty("enableLegacyFilename"))
+                        if (typeof message.enableLegacyFilename !== "boolean")
+                            return "enableLegacyFilename: boolean expected";
                     return null;
                 };
     
diff --git a/flyteidl/gen/pb_python/flyteidl/core/types_pb2.py b/flyteidl/gen/pb_python/flyteidl/core/types_pb2.py
index 3043a0cf6b8..549ba55fd00 100644
--- a/flyteidl/gen/pb_python/flyteidl/core/types_pb2.py
+++ b/flyteidl/gen/pb_python/flyteidl/core/types_pb2.py
@@ -14,7 +14,7 @@
 from google.protobuf import struct_pb2 as google_dot_protobuf_dot_struct__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x19\x66lyteidl/core/types.proto\x12\rflyteidl.core\x1a\x1cgoogle/protobuf/struct.proto\"\xa1\x02\n\nSchemaType\x12@\n\x07\x63olumns\x18\x03 \x03(\x0b\x32&.flyteidl.core.SchemaType.SchemaColumnR\x07\x63olumns\x1a\xd0\x01\n\x0cSchemaColumn\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12K\n\x04type\x18\x02 \x01(\x0e\x32\x37.flyteidl.core.SchemaType.SchemaColumn.SchemaColumnTypeR\x04type\"_\n\x10SchemaColumnType\x12\x0b\n\x07INTEGER\x10\x00\x12\t\n\x05\x46LOAT\x10\x01\x12\n\n\x06STRING\x10\x02\x12\x0b\n\x07\x42OOLEAN\x10\x03\x12\x0c\n\x08\x44\x41TETIME\x10\x04\x12\x0c\n\x08\x44URATION\x10\x05\"\xc7\x02\n\x15StructuredDatasetType\x12L\n\x07\x63olumns\x18\x01 \x03(\x0b\x32\x32.flyteidl.core.StructuredDatasetType.DatasetColumnR\x07\x63olumns\x12\x16\n\x06\x66ormat\x18\x02 \x01(\tR\x06\x66ormat\x12\x30\n\x14\x65xternal_schema_type\x18\x03 \x01(\tR\x12\x65xternalSchemaType\x12\x32\n\x15\x65xternal_schema_bytes\x18\x04 \x01(\x0cR\x13\x65xternalSchemaBytes\x1a\x62\n\rDatasetColumn\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12=\n\x0cliteral_type\x18\x02 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x0bliteralType\"\xa7\x01\n\x08\x42lobType\x12\x16\n\x06\x66ormat\x18\x01 \x01(\tR\x06\x66ormat\x12R\n\x0e\x64imensionality\x18\x02 \x01(\x0e\x32*.flyteidl.core.BlobType.BlobDimensionalityR\x0e\x64imensionality\"/\n\x12\x42lobDimensionality\x12\n\n\x06SINGLE\x10\x00\x12\r\n\tMULTIPART\x10\x01\"\"\n\x08\x45numType\x12\x16\n\x06values\x18\x01 \x03(\tR\x06values\"C\n\tUnionType\x12\x36\n\x08variants\x18\x01 \x03(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x08variants\"\xd7\x01\n\rTypeStructure\x12\x10\n\x03tag\x18\x01 \x01(\tR\x03tag\x12V\n\x0e\x64\x61taclass_type\x18\x02 \x03(\x0b\x32/.flyteidl.core.TypeStructure.DataclassTypeEntryR\rdataclassType\x1a\\\n\x12\x44\x61taclassTypeEntry\x12\x10\n\x03key\x18\x01 \x01(\tR\x03key\x12\x30\n\x05value\x18\x02 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x05value:\x02\x38\x01\"K\n\x0eTypeAnnotation\x12\x39\n\x0b\x61nnotations\x18\x01 \x01(\x0b\x32\x17.google.protobuf.StructR\x0b\x61nnotations\"\xbc\x05\n\x0bLiteralType\x12\x33\n\x06simple\x18\x01 \x01(\x0e\x32\x19.flyteidl.core.SimpleTypeH\x00R\x06simple\x12\x33\n\x06schema\x18\x02 \x01(\x0b\x32\x19.flyteidl.core.SchemaTypeH\x00R\x06schema\x12\x45\n\x0f\x63ollection_type\x18\x03 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeH\x00R\x0e\x63ollectionType\x12\x42\n\x0emap_value_type\x18\x04 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeH\x00R\x0cmapValueType\x12-\n\x04\x62lob\x18\x05 \x01(\x0b\x32\x17.flyteidl.core.BlobTypeH\x00R\x04\x62lob\x12\x36\n\tenum_type\x18\x07 \x01(\x0b\x32\x17.flyteidl.core.EnumTypeH\x00R\x08\x65numType\x12^\n\x17structured_dataset_type\x18\x08 \x01(\x0b\x32$.flyteidl.core.StructuredDatasetTypeH\x00R\x15structuredDatasetType\x12\x39\n\nunion_type\x18\n \x01(\x0b\x32\x18.flyteidl.core.UnionTypeH\x00R\tunionType\x12\x33\n\x08metadata\x18\x06 \x01(\x0b\x32\x17.google.protobuf.StructR\x08metadata\x12=\n\nannotation\x18\t \x01(\x0b\x32\x1d.flyteidl.core.TypeAnnotationR\nannotation\x12:\n\tstructure\x18\x0b \x01(\x0b\x32\x1c.flyteidl.core.TypeStructureR\tstructureB\x06\n\x04type\"z\n\x0fOutputReference\x12\x17\n\x07node_id\x18\x01 \x01(\tR\x06nodeId\x12\x10\n\x03var\x18\x02 \x01(\tR\x03var\x12<\n\tattr_path\x18\x03 \x03(\x0b\x32\x1f.flyteidl.core.PromiseAttributeR\x08\x61ttrPath\"_\n\x10PromiseAttribute\x12#\n\x0cstring_value\x18\x01 \x01(\tH\x00R\x0bstringValue\x12\x1d\n\tint_value\x18\x02 \x01(\x05H\x00R\x08intValueB\x07\n\x05value\"G\n\x05\x45rror\x12$\n\x0e\x66\x61iled_node_id\x18\x01 \x01(\tR\x0c\x66\x61iledNodeId\x12\x18\n\x07message\x18\x02 \x01(\tR\x07message*\x86\x01\n\nSimpleType\x12\x08\n\x04NONE\x10\x00\x12\x0b\n\x07INTEGER\x10\x01\x12\t\n\x05\x46LOAT\x10\x02\x12\n\n\x06STRING\x10\x03\x12\x0b\n\x07\x42OOLEAN\x10\x04\x12\x0c\n\x08\x44\x41TETIME\x10\x05\x12\x0c\n\x08\x44URATION\x10\x06\x12\n\n\x06\x42INARY\x10\x07\x12\t\n\x05\x45RROR\x10\x08\x12\n\n\x06STRUCT\x10\tB\xb0\x01\n\x11\x63om.flyteidl.coreB\nTypesProtoP\x01Z:github.com/flyteorg/flyte/flyteidl/gen/pb-go/flyteidl/core\xa2\x02\x03\x46\x43X\xaa\x02\rFlyteidl.Core\xca\x02\rFlyteidl\\Core\xe2\x02\x19\x46lyteidl\\Core\\GPBMetadata\xea\x02\x0e\x46lyteidl::Coreb\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x19\x66lyteidl/core/types.proto\x12\rflyteidl.core\x1a\x1cgoogle/protobuf/struct.proto\"\xa1\x02\n\nSchemaType\x12@\n\x07\x63olumns\x18\x03 \x03(\x0b\x32&.flyteidl.core.SchemaType.SchemaColumnR\x07\x63olumns\x1a\xd0\x01\n\x0cSchemaColumn\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12K\n\x04type\x18\x02 \x01(\x0e\x32\x37.flyteidl.core.SchemaType.SchemaColumn.SchemaColumnTypeR\x04type\"_\n\x10SchemaColumnType\x12\x0b\n\x07INTEGER\x10\x00\x12\t\n\x05\x46LOAT\x10\x01\x12\n\n\x06STRING\x10\x02\x12\x0b\n\x07\x42OOLEAN\x10\x03\x12\x0c\n\x08\x44\x41TETIME\x10\x04\x12\x0c\n\x08\x44URATION\x10\x05\"\xc7\x02\n\x15StructuredDatasetType\x12L\n\x07\x63olumns\x18\x01 \x03(\x0b\x32\x32.flyteidl.core.StructuredDatasetType.DatasetColumnR\x07\x63olumns\x12\x16\n\x06\x66ormat\x18\x02 \x01(\tR\x06\x66ormat\x12\x30\n\x14\x65xternal_schema_type\x18\x03 \x01(\tR\x12\x65xternalSchemaType\x12\x32\n\x15\x65xternal_schema_bytes\x18\x04 \x01(\x0cR\x13\x65xternalSchemaBytes\x1a\x62\n\rDatasetColumn\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12=\n\x0cliteral_type\x18\x02 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x0bliteralType\"\x84\x02\n\x08\x42lobType\x12\x16\n\x06\x66ormat\x18\x01 \x01(\tR\x06\x66ormat\x12R\n\x0e\x64imensionality\x18\x02 \x01(\x0e\x32*.flyteidl.core.BlobType.BlobDimensionalityR\x0e\x64imensionality\x12%\n\x0e\x66ile_extension\x18\x03 \x01(\tR\rfileExtension\x12\x34\n\x16\x65nable_legacy_filename\x18\x04 \x01(\x08R\x14\x65nableLegacyFilename\"/\n\x12\x42lobDimensionality\x12\n\n\x06SINGLE\x10\x00\x12\r\n\tMULTIPART\x10\x01\"\"\n\x08\x45numType\x12\x16\n\x06values\x18\x01 \x03(\tR\x06values\"C\n\tUnionType\x12\x36\n\x08variants\x18\x01 \x03(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x08variants\"\xd7\x01\n\rTypeStructure\x12\x10\n\x03tag\x18\x01 \x01(\tR\x03tag\x12V\n\x0e\x64\x61taclass_type\x18\x02 \x03(\x0b\x32/.flyteidl.core.TypeStructure.DataclassTypeEntryR\rdataclassType\x1a\\\n\x12\x44\x61taclassTypeEntry\x12\x10\n\x03key\x18\x01 \x01(\tR\x03key\x12\x30\n\x05value\x18\x02 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x05value:\x02\x38\x01\"K\n\x0eTypeAnnotation\x12\x39\n\x0b\x61nnotations\x18\x01 \x01(\x0b\x32\x17.google.protobuf.StructR\x0b\x61nnotations\"\xbc\x05\n\x0bLiteralType\x12\x33\n\x06simple\x18\x01 \x01(\x0e\x32\x19.flyteidl.core.SimpleTypeH\x00R\x06simple\x12\x33\n\x06schema\x18\x02 \x01(\x0b\x32\x19.flyteidl.core.SchemaTypeH\x00R\x06schema\x12\x45\n\x0f\x63ollection_type\x18\x03 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeH\x00R\x0e\x63ollectionType\x12\x42\n\x0emap_value_type\x18\x04 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeH\x00R\x0cmapValueType\x12-\n\x04\x62lob\x18\x05 \x01(\x0b\x32\x17.flyteidl.core.BlobTypeH\x00R\x04\x62lob\x12\x36\n\tenum_type\x18\x07 \x01(\x0b\x32\x17.flyteidl.core.EnumTypeH\x00R\x08\x65numType\x12^\n\x17structured_dataset_type\x18\x08 \x01(\x0b\x32$.flyteidl.core.StructuredDatasetTypeH\x00R\x15structuredDatasetType\x12\x39\n\nunion_type\x18\n \x01(\x0b\x32\x18.flyteidl.core.UnionTypeH\x00R\tunionType\x12\x33\n\x08metadata\x18\x06 \x01(\x0b\x32\x17.google.protobuf.StructR\x08metadata\x12=\n\nannotation\x18\t \x01(\x0b\x32\x1d.flyteidl.core.TypeAnnotationR\nannotation\x12:\n\tstructure\x18\x0b \x01(\x0b\x32\x1c.flyteidl.core.TypeStructureR\tstructureB\x06\n\x04type\"z\n\x0fOutputReference\x12\x17\n\x07node_id\x18\x01 \x01(\tR\x06nodeId\x12\x10\n\x03var\x18\x02 \x01(\tR\x03var\x12<\n\tattr_path\x18\x03 \x03(\x0b\x32\x1f.flyteidl.core.PromiseAttributeR\x08\x61ttrPath\"_\n\x10PromiseAttribute\x12#\n\x0cstring_value\x18\x01 \x01(\tH\x00R\x0bstringValue\x12\x1d\n\tint_value\x18\x02 \x01(\x05H\x00R\x08intValueB\x07\n\x05value\"G\n\x05\x45rror\x12$\n\x0e\x66\x61iled_node_id\x18\x01 \x01(\tR\x0c\x66\x61iledNodeId\x12\x18\n\x07message\x18\x02 \x01(\tR\x07message*\x86\x01\n\nSimpleType\x12\x08\n\x04NONE\x10\x00\x12\x0b\n\x07INTEGER\x10\x01\x12\t\n\x05\x46LOAT\x10\x02\x12\n\n\x06STRING\x10\x03\x12\x0b\n\x07\x42OOLEAN\x10\x04\x12\x0c\n\x08\x44\x41TETIME\x10\x05\x12\x0c\n\x08\x44URATION\x10\x06\x12\n\n\x06\x42INARY\x10\x07\x12\t\n\x05\x45RROR\x10\x08\x12\n\n\x06STRUCT\x10\tB\xb0\x01\n\x11\x63om.flyteidl.coreB\nTypesProtoP\x01Z:github.com/flyteorg/flyte/flyteidl/gen/pb-go/flyteidl/core\xa2\x02\x03\x46\x43X\xaa\x02\rFlyteidl.Core\xca\x02\rFlyteidl\\Core\xe2\x02\x19\x46lyteidl\\Core\\GPBMetadata\xea\x02\x0e\x46lyteidl::Coreb\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -25,8 +25,8 @@
   DESCRIPTOR._serialized_options = b'\n\021com.flyteidl.coreB\nTypesProtoP\001Z:github.com/flyteorg/flyte/flyteidl/gen/pb-go/flyteidl/core\242\002\003FCX\252\002\rFlyteidl.Core\312\002\rFlyteidl\\Core\342\002\031Flyteidl\\Core\\GPBMetadata\352\002\016Flyteidl::Core'
   _TYPESTRUCTURE_DATACLASSTYPEENTRY._options = None
   _TYPESTRUCTURE_DATACLASSTYPEENTRY._serialized_options = b'8\001'
-  _globals['_SIMPLETYPE']._serialized_start=2264
-  _globals['_SIMPLETYPE']._serialized_end=2398
+  _globals['_SIMPLETYPE']._serialized_start=2357
+  _globals['_SIMPLETYPE']._serialized_end=2491
   _globals['_SCHEMATYPE']._serialized_start=75
   _globals['_SCHEMATYPE']._serialized_end=364
   _globals['_SCHEMATYPE_SCHEMACOLUMN']._serialized_start=156
@@ -38,25 +38,25 @@
   _globals['_STRUCTUREDDATASETTYPE_DATASETCOLUMN']._serialized_start=596
   _globals['_STRUCTUREDDATASETTYPE_DATASETCOLUMN']._serialized_end=694
   _globals['_BLOBTYPE']._serialized_start=697
-  _globals['_BLOBTYPE']._serialized_end=864
-  _globals['_BLOBTYPE_BLOBDIMENSIONALITY']._serialized_start=817
-  _globals['_BLOBTYPE_BLOBDIMENSIONALITY']._serialized_end=864
-  _globals['_ENUMTYPE']._serialized_start=866
-  _globals['_ENUMTYPE']._serialized_end=900
-  _globals['_UNIONTYPE']._serialized_start=902
-  _globals['_UNIONTYPE']._serialized_end=969
-  _globals['_TYPESTRUCTURE']._serialized_start=972
-  _globals['_TYPESTRUCTURE']._serialized_end=1187
-  _globals['_TYPESTRUCTURE_DATACLASSTYPEENTRY']._serialized_start=1095
-  _globals['_TYPESTRUCTURE_DATACLASSTYPEENTRY']._serialized_end=1187
-  _globals['_TYPEANNOTATION']._serialized_start=1189
-  _globals['_TYPEANNOTATION']._serialized_end=1264
-  _globals['_LITERALTYPE']._serialized_start=1267
-  _globals['_LITERALTYPE']._serialized_end=1967
-  _globals['_OUTPUTREFERENCE']._serialized_start=1969
-  _globals['_OUTPUTREFERENCE']._serialized_end=2091
-  _globals['_PROMISEATTRIBUTE']._serialized_start=2093
-  _globals['_PROMISEATTRIBUTE']._serialized_end=2188
-  _globals['_ERROR']._serialized_start=2190
-  _globals['_ERROR']._serialized_end=2261
+  _globals['_BLOBTYPE']._serialized_end=957
+  _globals['_BLOBTYPE_BLOBDIMENSIONALITY']._serialized_start=910
+  _globals['_BLOBTYPE_BLOBDIMENSIONALITY']._serialized_end=957
+  _globals['_ENUMTYPE']._serialized_start=959
+  _globals['_ENUMTYPE']._serialized_end=993
+  _globals['_UNIONTYPE']._serialized_start=995
+  _globals['_UNIONTYPE']._serialized_end=1062
+  _globals['_TYPESTRUCTURE']._serialized_start=1065
+  _globals['_TYPESTRUCTURE']._serialized_end=1280
+  _globals['_TYPESTRUCTURE_DATACLASSTYPEENTRY']._serialized_start=1188
+  _globals['_TYPESTRUCTURE_DATACLASSTYPEENTRY']._serialized_end=1280
+  _globals['_TYPEANNOTATION']._serialized_start=1282
+  _globals['_TYPEANNOTATION']._serialized_end=1357
+  _globals['_LITERALTYPE']._serialized_start=1360
+  _globals['_LITERALTYPE']._serialized_end=2060
+  _globals['_OUTPUTREFERENCE']._serialized_start=2062
+  _globals['_OUTPUTREFERENCE']._serialized_end=2184
+  _globals['_PROMISEATTRIBUTE']._serialized_start=2186
+  _globals['_PROMISEATTRIBUTE']._serialized_end=2281
+  _globals['_ERROR']._serialized_start=2283
+  _globals['_ERROR']._serialized_end=2354
 # @@protoc_insertion_point(module_scope)
diff --git a/flyteidl/gen/pb_python/flyteidl/core/types_pb2.pyi b/flyteidl/gen/pb_python/flyteidl/core/types_pb2.pyi
index 9028afabd55..ec8dba49eec 100644
--- a/flyteidl/gen/pb_python/flyteidl/core/types_pb2.pyi
+++ b/flyteidl/gen/pb_python/flyteidl/core/types_pb2.pyi
@@ -77,7 +77,7 @@ class StructuredDatasetType(_message.Message):
     def __init__(self, columns: _Optional[_Iterable[_Union[StructuredDatasetType.DatasetColumn, _Mapping]]] = ..., format: _Optional[str] = ..., external_schema_type: _Optional[str] = ..., external_schema_bytes: _Optional[bytes] = ...) -> None: ...
 
 class BlobType(_message.Message):
-    __slots__ = ["format", "dimensionality"]
+    __slots__ = ["format", "dimensionality", "file_extension", "enable_legacy_filename"]
     class BlobDimensionality(int, metaclass=_enum_type_wrapper.EnumTypeWrapper):
         __slots__ = []
         SINGLE: _ClassVar[BlobType.BlobDimensionality]
@@ -86,9 +86,13 @@ class BlobType(_message.Message):
     MULTIPART: BlobType.BlobDimensionality
     FORMAT_FIELD_NUMBER: _ClassVar[int]
     DIMENSIONALITY_FIELD_NUMBER: _ClassVar[int]
+    FILE_EXTENSION_FIELD_NUMBER: _ClassVar[int]
+    ENABLE_LEGACY_FILENAME_FIELD_NUMBER: _ClassVar[int]
     format: str
     dimensionality: BlobType.BlobDimensionality
-    def __init__(self, format: _Optional[str] = ..., dimensionality: _Optional[_Union[BlobType.BlobDimensionality, str]] = ...) -> None: ...
+    file_extension: str
+    enable_legacy_filename: bool
+    def __init__(self, format: _Optional[str] = ..., dimensionality: _Optional[_Union[BlobType.BlobDimensionality, str]] = ..., file_extension: _Optional[str] = ..., enable_legacy_filename: bool = ...) -> None: ...
 
 class EnumType(_message.Message):
     __slots__ = ["values"]
diff --git a/flyteidl/gen/pb_rust/flyteidl.core.rs b/flyteidl/gen/pb_rust/flyteidl.core.rs
index 4975baeb564..14b1838114a 100644
--- a/flyteidl/gen/pb_rust/flyteidl.core.rs
+++ b/flyteidl/gen/pb_rust/flyteidl.core.rs
@@ -105,6 +105,20 @@ pub struct BlobType {
     pub format: ::prost::alloc::string::String,
     #[prost(enumeration="blob_type::BlobDimensionality", tag="2")]
     pub dimensionality: i32,
+    /// Optional file extension (e.g. "csv", "parquet") to use during copilot download.
+    /// Default is "", which means no extension is appended.
+    /// Differences from "format":
+    ///    1. "format" is used for type validation in flytekit, "file_extension" is not.
+    ///    2. "file_extension" controls the file extension of the blob when materializing
+    ///     to local disk during copilot download, unlike "format".
+    #[prost(string, tag="3")]
+    pub file_extension: ::prost::alloc::string::String,
+    /// When true and file_extension is non-empty, the copilot download phase
+    /// writes the blob to both the full path (with extension) and the
+    /// old path (without extension), preserving backward compatibility for
+    /// workflows with tasks that may read from both. Default is false.
+    #[prost(bool, tag="4")]
+    pub enable_legacy_filename: bool,
 }
 /// Nested message and enum types in `BlobType`.
 pub mod blob_type {
diff --git a/flyteidl/protos/flyteidl/core/types.proto b/flyteidl/protos/flyteidl/core/types.proto
index 3580eea9f00..c575901a6ca 100644
--- a/flyteidl/protos/flyteidl/core/types.proto
+++ b/flyteidl/protos/flyteidl/core/types.proto
@@ -80,6 +80,20 @@ message BlobType {
     // csv, parquet etc
     string format = 1;
     BlobDimensionality dimensionality = 2;
+
+    // Optional file extension (e.g. "csv", "parquet") to use during copilot download.
+    // Default is "", which means no extension is appended.
+    // Differences from "format":
+    //   1. "format" is used for type validation in flytekit, "file_extension" is not.
+    //   2. "file_extension" controls the file extension of the blob when materializing
+    //    to local disk during copilot download, unlike "format".
+    string file_extension = 3;
+
+    // When true and file_extension is non-empty, the copilot download phase
+    // writes the blob to both the full path (with extension) and the
+    // old path (without extension), preserving backward compatibility for
+    // workflows with tasks that may read from both. Default is false.
+    bool enable_legacy_filename = 4;
 }
 
 // Enables declaring enum types, with predefined string values