diff --git a/include/wmsdkidl.idl b/include/wmsdkidl.idl
index 4cb1db7b022..91dc000ac12 100644
--- a/include/wmsdkidl.idl
+++ b/include/wmsdkidl.idl
@@ -345,3 +345,42 @@ interface IWMSyncReader : IUnknown
     HRESULT OpenStream(
         [in] IStream *pStream);
 };
+
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_Base,   0x00000000,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIATYPE_Video,     0x73646976,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_RGB1,   0xe436eb78,0x524f,0x11ce,0x9f,0x53,0x00,0x20,0xaf,0x0b,0xa7,0x70);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_RGB4,   0xe436eb79,0x524f,0x11ce,0x9f,0x53,0x00,0x20,0xaf,0x0b,0xa7,0x70);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_RGB8,   0xe436eb7a,0x524f,0x11ce,0x9f,0x53,0x00,0x20,0xaf,0x0b,0xa7,0x70);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_RGB565, 0xe436eb7b,0x524f,0x11ce,0x9f,0x53,0x00,0x20,0xaf,0x0b,0xa7,0x70);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_RGB555, 0xe436eb7c,0x524f,0x11ce,0x9f,0x53,0x00,0x20,0xaf,0x0b,0xa7,0x70);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_RGB24,  0xe436eb7d,0x524f,0x11ce,0x9f,0x53,0x00,0x20,0xaf,0x0b,0xa7,0x70);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_RGB32,  0xe436eb7e,0x524f,0x11ce,0x9f,0x53,0x00,0x20,0xaf,0x0b,0xa7,0x70);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_I420,   0x30323449,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_IYUV,   0x56555949,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_YV12,   0x32315659,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_YUY2,   0x32595559,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_P422,   0x32323450,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_UYVY,   0x59565955,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_YVYU,   0x55595659,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_YVU9,   0x39555659,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_VIDEOIMAGE, 0x1d4a45f2,0xe5f6,0x4b44,0x83,0x88,0xf0,0xae,0x5c,0x0e,0x0c,0x37);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_MP43,   0x3334504d,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_MP4S,   0x5334504d,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_M4S2,   0x3253344d,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WMV1,   0x31564d57,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WMV2,   0x32564d57,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_MSS1,   0x3153534d,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_MPEG2_VIDEO, 0xe06d8026,0xdb46,0x11cf,0xb4,0xd1,0x00,0x80,0x5f,0x6c,0xbb,0xea);")
+cpp_quote("EXTERN_GUID(WMMEDIATYPE_Audio,     0x73647561,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_PCM,    0x00000001,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_DRM,    0x00000009,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WMAudioV9,        0x00000162,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WMAudio_Lossless, 0x00000163,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_MSS2,   0x3253534d,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WMSP1,  0x0000000a,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WMSP2,  0x0000000b,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WMV3,   0x33564d57,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WMVP,   0x50564d57,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WVP2,   0x32505657,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WMVA,   0x41564d57,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("EXTERN_GUID(WMMEDIASUBTYPE_WVC1,   0x31435657,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")