diff --git a/include/Makefile.in b/include/Makefile.in
index eae7feef2da..7d3d39ee5e2 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -28,6 +28,9 @@ INSTALLED_INCLUDES = \
 	dinput.h \
 	dispdib.h \
 	dlgs.h \
+	dmo.h \
+	dmoreg.h \
+	dmort.h \
 	docobj.h \
 	dplay.h \
 	dplobby.h \
@@ -47,6 +50,8 @@ INSTALLED_INCLUDES = \
 	mapidefs.h \
 	mciavi.h \
 	mcx.h \
+	mediaerr.h \
+	mediaobj.h \
 	minmax.h \
 	mmreg.h \
 	mmsystem.h \
diff --git a/include/dmo.h b/include/dmo.h
new file mode 100644
index 00000000000..db4216b15a7
--- /dev/null
+++ b/include/dmo.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2002 Hidenori Takeshima
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __WINE_DMO_H_
+#define __WINE_DMO_H_
+
+#include "mediaobj.h"
+#include "dmoreg.h"
+#include "dmort.h"
+#include "mediaerr.h"
+
+
+#endif	/* __WINE_DMO_H_ */
diff --git a/include/dmoreg.h b/include/dmoreg.h
new file mode 100644
index 00000000000..beb3c9450a0
--- /dev/null
+++ b/include/dmoreg.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2002 Hidenori Takeshima
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __WINE_DMOREG_H_
+#define __WINE_DMOREG_H_
+
+
+/* structs. */
+
+typedef struct
+{
+	GUID	type;
+	GUID	subtype;
+} DMO_PARTIAL_MEDIATYPE;
+
+/* exported APIs */
+
+HRESULT WINAPI DMOEnum( REFGUID rguidCat, DWORD dwFlags, DWORD dwCountOfInTypes, const DMO_PARTIAL_MEDIATYPE* pInTypes, DWORD dwCountOfOutTypes, const DMO_PARTIAL_MEDIATYPE* pOutTypes, IEnumDMO** ppEnum );
+
+HRESULT WINAPI DMOGetName( REFCLSID rclsid, WCHAR* pwszName );
+
+HRESULT WINAPI DMOGetTypes( REFCLSID rclsid, unsigned long ulInputTypesReq, unsigned long* pulInputTypesRet, unsigned long ulOutputTypesReq, unsigned long* pulOutputTypesRet, const DMO_PARTIAL_MEDIATYPE* pOutTypes );
+
+/* DMOGuidToStrA - undocumented */
+/* DMOGuidToStrW - undocumented */
+
+HRESULT WINAPI DMORegister( LPCWSTR pwszName, REFCLSID rclsid, REFGUID rguidCat, DWORD dwFlags, DWORD dwCountOfInTypes, const DMO_PARTIAL_MEDIATYPE* pInTypes, DWORD dwCountOfOutTypes, const DMO_PARTIAL_MEDIATYPE* pOutTypes );
+
+/* DMOStrToGuidA - undocumented */
+/* DMOStrToGuidW - undocumented */
+
+HRESULT WINAPI DMOUnregister( REFCLSID rclsid, REFGUID rguidCat );
+
+
+#endif	/* __WINE_DMOREG_H_ */
diff --git a/include/dmort.h b/include/dmort.h
new file mode 100644
index 00000000000..3a12ab07fc9
--- /dev/null
+++ b/include/dmort.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2002 Hidenori Takeshima
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __WINE_DMORT_H_
+#define __WINE_DMORT_H_
+
+
+/* exported APIs */
+
+HRESULT WINAPI MoCopyMediaType( DMO_MEDIA_TYPE* pmtDst, const DMO_MEDIA_TYPE* pmtSrc );
+HRESULT WINAPI MoCreateMediaType( DMO_MEDIA_TYPE** ppmt, DWORD cbFormat );
+HRESULT WINAPI MoDeleteMediaType( DMO_MEDIA_TYPE* pmt );
+HRESULT WINAPI MoDuplicateMediaType( DMO_MEDIA_TYPE** ppmtDest, const DMO_MEDIA_TYPE* pmtSrc );
+HRESULT WINAPI MoFreeMediaType( DMO_MEDIA_TYPE* pmt );
+HRESULT WINAPI MoInitMediaType( DMO_MEDIA_TYPE* pmt, DWORD cbFormat );
+
+
+#endif	/* __WINE_DMORT_H_ */
diff --git a/include/mediaerr.h b/include/mediaerr.h
new file mode 100644
index 00000000000..5b7c9172278
--- /dev/null
+++ b/include/mediaerr.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2002 Hidenori Takeshima
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __WINE_MEDIAERR_H_
+#define __WINE_MEDIAERR_H_
+
+#define DMO_E_INVALIDSTREAMINDEX			0x80040201
+#define DMO_E_INVALIDTYPE				0x80040202
+#define DMO_E_TYPE_NOT_SET				0x80040203
+#define DMO_E_NOTACCEPTING				0x80040204
+#define DMO_E_TYPE_NOT_ACCEPTED				0x80040205
+#define DMO_E_NO_MORE_ITEMS				0x80040206
+
+#endif	/* __WINE_MEDIAERR_H_ */
diff --git a/include/mediaobj.h b/include/mediaobj.h
new file mode 100644
index 00000000000..b6aaff9f03c
--- /dev/null
+++ b/include/mediaobj.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2002 Hidenori Takeshima
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __WINE_MEDIAOBJ_H_
+#define __WINE_MEDIAOBJ_H_
+
+/* forward decls. */
+
+typedef struct IDMOQualityControl IDMOQualityControl;
+typedef struct IDMOVideoOutputOptimizations IDMOVideoOutputOptimizations;
+typedef struct IEnumDMO IEnumDMO;
+typedef struct IMediaBuffer IMediaBuffer;
+typedef struct IMediaObject IMediaObject;
+typedef struct IMediaObjectInPlace IMediaObjectInPlace;
+
+
+
+/* structs. */
+
+typedef struct
+{
+	GUID	majortype;
+	GUID	subtype;
+	BOOL	bFixedSizeSamples;
+	BOOL	bTemporalCompression;
+	ULONG	lSampleSize;
+	GUID	formattype;
+	IUnknown*	pUnk;
+	ULONG	cbFormat;
+	BYTE*	pbFormat;
+} DMO_MEDIA_TYPE;
+
+
+
+#endif	/* __WINE_MEDIAOBJ_H_ */