[Bug 29646] New: Microsoft Wine Guide crashes after playing one video clip

http://bugs.winehq.org/show_bug.cgi?id=29646

Bug #: 29646
           Summary: Microsoft Wine Guide crashes after playing one video
                    clip
           Product: Wine
           Version: 1.3.37
          Platform: x86-64
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: msvfw32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

Created attachment 38424
  --> http://bugs.winehq.org/attachment.cgi?id=38424
+mci log

This bug applies to Microsoft Wine Guide 1.0a, a multimedia CD-ROM from 1995.

There are various video clips which should play when the user clicks the
appropriate icon. The clips are AVI files with names ending .CP, e.g.
ACIDITY.CP, ALLABOUT.CP, INTRO.CP. Wine MCI (or msvfw32?) refuses to play them,
since the file extension is not .avi. On Windows the videos play as they
should.

After adding a registry key to associate the .cp extension with AVI files (in
HKLM\Software\Microsoft\Windows NT\CurrentVersion\MCI Extensions), it is
possible to play one video clip. However, after doing that, clicking on any
link causes the program to crash. Navigating between links/pages works fine
before playing a video clip.

The attached +mci log was created (after adding the registry key mentioned
above) like this:
 - Start Microsoft Wine Guide
 - Click on icon to play introductory video clip
 - Click again on the video to stop it playing
 - Click "Wine tasting with Oz"

An extract from the log:

trace:mci:MCIWndProc MCIWNDM_SENDSTRINGA (invalid)
wine: Unhandled page fault on read access to 0x12772fce at address 0xf7559bc6
(thread 0026), starting debugger...
...
Backtrace:
=>0 0xf7559bc6 in libc.so.6 (+0x7cbc6) (0x007bcfa8)
  1 0x7bc687fc RtlInitAnsiString+0x2b(target=0x7bcfc8, source="")
[/build/buildd/wine1.3-1.3.37/dlls/ntdll/rtlstr.c:105] in ntdll (0x007bcfa8)
  2 0x7bc69ce9 RtlCreateUnicodeStringFromAsciiz+0x28(target=0x7bd50c, src="")
[/build/buildd/wine1.3-1.3.37/dlls/ntdll/rtlstr.c:301] in ntdll (0x007bcfd8)
  3 0x7e1fddd8 MCIWndProc+0xbd7(hWnd=0x2002a, wMsg=0x465, wParam=0,
lParam=0x12772fc6) [/build/buildd/wine1.3-1.3.37/dlls/msvfw32/mciwnd.c:980] in
msvfw32 (0x007bd578)
  4 0x7ecc776a WINPROC_wrapper+0x19() in user32 (0x007bd5a8)
...