diff --git a/src/windows/WslcSDK/wslcsdk-winrt.idl b/src/windows/WslcSDK/wslcsdk-winrt.idl
new file mode 100644
index 000000000..d8b055b78
--- /dev/null
+++ b/src/windows/WslcSDK/wslcsdk-winrt.idl
@@ -0,0 +1,348 @@
+/*++
+
+Copyright (c) Microsoft. All rights reserved.
+
+Module Name:
+
+    wslcsdk.idl
+
+Abstract:
+
+    This file contains the public WSL Container SDK api definitions.
+
+--*/
+
+namespace Microsoft.WSL.Containers
+{
+    [flags]
+    enum SessionFeatureFlags
+    {
+        None = 0x00000000,
+        EnableGpu = 0x00000004
+    };
+
+    enum SessionTerminationReason
+    {
+        Unknown = 0,
+        Shutdown = 1,
+        Crashed = 2,
+    };
+
+    delegate void SessionTerminationHandler(Session session, SessionTerminationReason reason);
+
+    runtimeclass SessionSettings
+    {
+        SessionSettings(String name, String storagePath);
+
+        String Name { get; };
+        String StoragePath { get; };
+
+        UInt32 CpuCount { get; set; };
+        UInt32 MemoryMb { get; set; };
+        UInt32 TimeoutMS { get; set; };
+        VhdRequirements VhdRequirements { get; set; };
+        SessionFeatureFlags FeatureFlags { get; set; };
+        SessionTerminationHandler TerminationHandler { get; set; };
+    };
+
+    runtimeclass Session
+    {
+        static Session Create(SessionSettings settings);
+
+        void Terminate();
+
+        void PullImage(PullImageOptions options);
+
+        // C# type: System.IO.Stream
+        void ImportImage(String imageName, Windows.Storage.Streams.IInputStream imageStream, ImportImageOptions options);
+        void ImportImageFromFile(String imageName, String path, ImportImageOptions options);
+
+        // C# type: System.IO.Stream
+        void LoadImage(Windows.Storage.Streams.IInputStream imageStream, LoadImageOptions options);
+        void LoadImageFromFile(String path, LoadImageOptions options);
+
+        void DeleteSessionImage(String nameOrId);
+
+        void CreateSessionVhdVolume(VhdRequirements options);
+        void DeleteSessionVhdVolume(String name);
+
+        // C# projected type: System.Collections.Generic.IReadOnlyList<ImageInfo>
+        IVectorView<ImageInfo> Images { get; };
+    };
+
+
+    enum ContainerNetworkingMode
+    {
+        None = 0,
+        Bridged = 1,
+    };
+
+    [flags]
+    enum ContainerFlags
+    {
+        None = 0x00000000,
+        AutoRemove = 0x00000001,
+        EnableGpu = 0x00000002,
+        Privileged = 0x00000004,
+    };
+
+    enum PortProtocol
+    {
+        TCP = 0,
+        UDP = 1,
+    };
+
+    runtimeclass ContainerPortMapping
+    {
+        ContainerPortMapping(UInt16 windowsPort, UInt16 containerPort, PortProtocol protocol);
+
+        UInt16 WindowsPort { get; };
+        UInt16 ContainerPort { get; };
+        PortProtocol Protocol { get; };
+
+        // TODO sockaddr_storage* WindowsAddress { get; set; };
+    };
+
+    runtimeclass ContainerVolume
+    {
+        ContainerVolume(String windowsPath, String containerPath, Boolean readOnly);
+
+        String WindowsPath { get; };
+        String ContainerPath { get; };
+        Boolean ReadOnly { get; };
+    };
+
+    runtimeclass ContainerNamedVolume
+    {
+        ContainerNamedVolume(String name, String containerPath, Boolean readOnly);
+
+        String Name { get; };
+        String ContainerPath { get; };
+        Boolean ReadOnly { get; };
+    };
+
+    [flags]
+    enum ContainerStartFlags
+    {
+        None = 0x00000000,
+        Attach = 0x00000001,
+    };
+
+    enum ContainerState
+    {
+        Invalid = 0,
+        Created = 1,
+        Running = 2,
+        Exited = 3,
+        Deleted = 4,
+    };
+
+    [flags]
+    enum DeleteContainerFlags
+    {
+        None = 0,
+        Force = 0x01
+    };
+
+    runtimeclass ContainerSettings
+    {
+        ContainerSettings(String imageName);
+
+        String ImageName { get; };
+
+        String Name { get; set; };
+        ProcessSettings InitProcess { get; set; };
+        ContainerNetworkingMode NetworkingMode { get; set; };
+        String HostName { get; set; };
+        String DomainName { get; set; };
+        ContainerFlags Flags { get; set; };
+        // C# projected type: System.Collections.Generic.IList<ContainerPortMapping>
+        IVector<ContainerPortMapping> PortMappings { get; set; };
+        // C# projected type: System.Collections.Generic.IList<ContainerVolume>
+        IVector<ContainerVolume> Volumes { get; set; };
+        // C# projected type: System.Collections.Generic.IList<ContainerNamedVolume>
+        IVector<ContainerNamedVolume> NamedVolumes { get; set; };
+    };
+
+    enum Signal
+    {
+        None = 0,     // No signal; reserved for future use
+        SIGHUP = 1,   // SIGHUP: reload / hangup
+        SIGINT = 2,   // SIGINT: interrupt (Ctrl-C)
+        SIGQUIT = 3,  // SIGQUIT: quit with core dump
+        SIGKILL = 9,  // SIGKILL: immediate termination
+        SIGTERM = 15, // SIGTERM: graceful shutdown
+    };
+
+    runtimeclass Container
+    {
+        static Container Create(Session session, ContainerSettings containerSettings);
+
+        void Start(ContainerStartFlags flags);
+        void Stop(Signal signal, UInt32 timeoutSeconds);
+        void Delete(DeleteContainerFlags flags);
+
+        Process CreateProcess(ProcessSettings newProcessSettings);
+
+        String Inspect();
+
+        String Id { get; };
+        Process InitProcess { get; };
+        ContainerState State { get; };
+    };
+
+    enum ProcessOutputHandle
+    {
+        StandardOutput = 1,
+        StandardError = 2,
+    };
+
+    delegate void ProcessOutputHandler(UInt8[] data);
+
+    delegate void ProcessExitHandler(Process process, Int32 exitCode);
+
+    runtimeclass ProcessEventHandlers
+    {
+        ProcessEventHandlers();
+
+        ProcessOutputHandler OnStdOut { get; set; };
+        ProcessOutputHandler OnStdErr { get; set; };
+        ProcessExitHandler OnExit { get; set; };
+    };
+
+    runtimeclass ProcessSettings
+    {
+        ProcessSettings();
+
+        String CurrentDirectory { get; set; };
+        // C# projected type: System.Collections.Generic.IList<String>
+        IVector<String> CmdLine { get; set; };
+        // C# equivalent type: System.Collections.Specialized.StringDictionary
+        // C# projected type: System.Collections.Generic.IDictionary<string,string?>
+        IMap<String, String> EnvironmentVariables { get; set; };
+        ProcessEventHandlers EventHandlers { get; set; };
+    };
+
+    enum ProcessState
+    {
+        Unknown = 0,
+        Running = 1,
+        Exited = 2,
+        Signalled = 3,
+    };
+
+    runtimeclass Process
+    {
+        UInt32 Pid { get; };
+        ProcessState State { get; };
+        Int32 ExitCode { get; };
+
+        void Signal(Signal signal);
+        // C# type: System.IO.Stream
+        Windows.Storage.Streams.IInputStream GetOutputStream(ProcessOutputHandle ioHandle);
+        // C# type: System.IO.Stream
+        Windows.Storage.Streams.IOutputStream GetInputStream();
+
+        event ProcessExitHandler Exited;
+    };
+
+    [flags]
+    enum ComponentFlags
+    {
+        None = 0,
+        VirtualMachinePlatform = 1,
+        WslPackage = 2,
+    };
+
+    struct Version
+    {
+        UInt32 Major;
+        UInt32 Minor;
+        UInt32 Revision;
+    };
+
+    delegate void InstallProgressHandler(ComponentFlags component, UInt32 progress, UInt32 total);
+
+    runtimeclass WslcService
+    {
+        static Boolean CanRun(out ComponentFlags missingComponents);
+        static Version GetVersion();
+        static void InstallWithDependencies(InstallProgressHandler progressCallback);
+    };
+
+    enum VhdType
+    {
+        Dynamic = 0,
+        Fixed = 1,
+    };
+
+    runtimeclass VhdRequirements
+    {
+        VhdRequirements(String name, UInt64 sizeInBytes, VhdType type);
+
+        String Name { get; };
+        UInt64 SizeInBytes { get; };
+        VhdType Type { get; };
+    };
+
+    struct ImageProgressDetail
+    {
+        UInt64 Current;
+        UInt64 Total;
+    };
+
+    enum ImageProgressStatus
+    {
+        Unknown = 0,
+        Pulling = 1,
+        Waiting = 2,
+        Downloading = 3,
+        Verifying = 4,
+        Extracting = 5,
+        Complete = 6,
+    };
+
+    struct ImageProgressMessage
+    {
+        String Id;
+        ImageProgressStatus Status;
+        ImageProgressDetail Detail;
+    };
+
+    delegate void ImageProgressHandler(ImageProgressMessage progress);
+
+    runtimeclass RegistryAuthenticationInformation
+    {
+        // TBD
+        String Placeholder {get; set;};
+    };
+
+    runtimeclass PullImageOptions
+    {
+        PullImageOptions(String uri);
+
+        String Uri { get; };
+        ImageProgressHandler ProgressHandler { get; set; };
+        RegistryAuthenticationInformation AuthInfo { get; set; };
+    };
+
+    runtimeclass ImportImageOptions
+    {
+        ImageProgressHandler ProgressHandler { get; set; };
+    };
+    runtimeclass LoadImageOptions
+    {
+        ImageProgressHandler ProgressHandler { get; set; };
+    };
+
+    runtimeclass ImageInfo
+    {
+        String Name { get; };
+        // C# equivalent type: byte[]
+        Windows.Storage.Streams.IBuffer Sha256 { get; };
+        UInt64 SizeBytes { get; };
+        // C# equivalent type: System.DateTime
+        // C# projected type: System.DateTimeOffset
+        Windows.Foundation.DateTime CreatedTimestamp { get; };
+    };
+}
\ No newline at end of file