Stub for midiOpenStream (helps hexen2demo).

include/wintypes.h

@@ -155,6 +155,7 @@ DECLARE_HANDLE(HMETAFILE);
 DECLARE_HANDLE(HMIDI);
 DECLARE_HANDLE(HMIDIIN);
 DECLARE_HANDLE(HMIDIOUT);
+DECLARE_HANDLE(HMIDISTRM);
 DECLARE_HANDLE(HMIXER);
 DECLARE_HANDLE(HMIXEROBJ);
 DECLARE_HANDLE(HMMIO);

multimedia/mmsystem.c

@@ -3090,6 +3090,14 @@ DWORD WINAPI midiInMessage16(HMIDIIN16 hMidiIn, UINT16 uMessage,
     return midMessage(0, uMessage, lpDesc->dwInstance, dwParam1, dwParam2);
 }
 
+/**************************************************************************
+ * 				midiStreamOpen		[MMSYSTEM.91]
+ */
+MMRESULT32 WINAPI midiStreamOpen32(HMIDISTRM32 *phms,LPUINT32 devid,DWORD cMidi,DWORD dwCallback,DWORD dwInstance,DWORD fdwOpen) {
+	FIXME(midi,"(%p,%p,%d,%p,%p,0x%08lx),stub!\n",phms,devid,cMidi,dwCallback,dwInstance,fdwOpen);
+	return MMSYSERR_NOTSUPPORTED;
+}
+
 
 /**************************************************************************
  * 				waveOutGetNumDevs		[MMSYSTEM.401]

relay32/winmm.spec

@@ -91,7 +91,7 @@ type win32
  88 stdcall midiOutShortMsg(long long) midiOutShortMsg32
  89 stdcall midiOutUnprepareHeader(long ptr long) midiOutUnprepareHeader32
  90 stub midiStreamClose
- 91 stub midiStreamOpen
+ 91 stdcall midiStreamOpen(ptr ptr long long long long) midiStreamOpen32
  92 stub midiStreamOut
  93 stub midiStreamPause
  94 stub midiStreamPosition