[Bug 50020] New: mf:mf tests crash on Windows 7

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50020

            Bug ID: 50020
           Summary: mf:mf tests crash on Windows 7
           Product: Wine
           Version: 5.19
          Hardware: x86-64
                OS: Windows
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: mfplat
          Assignee: wine-bugs at winehq.org
          Reporter: sven.wine at gmail.com

I feel like these tests don't actually test the right thing. If I change

https://source.winehq.org/git/wine.git/blob/0c249e6125fc9dc6ee86b4ef6ae0d9fa2fc6291b:/dlls/mf/tests/mf.c#l3008

to

    hr = IMFMediaTypeHandler_GetMediaTypeByIndex(handler, count-1,
&mediatype2);
    ok(hr == S_OK, "Failed to get media type, hr %#x.\n", hr);

    hr = IMFMediaTypeHandler_GetMediaTypeByIndex(handler, count-1,
&mediatype3);
    ok(hr == S_OK, "Failed to get media type, hr %#x.\n", hr);

I get

Windows 7:
mf.c:3017: Test failed: Unexpected hr 0.
mf.c:3049: Test failed: Failed to set current type, hr 0xc00d36b4.
mf.c:3053: Test failed: Unexpected instance.
mf.c:3125: Test failed: Failed to get interface, hr 0.

Windows 8:
mf.c:3017: Test failed: Unexpected hr 0.
mf.c:3049: Test failed: Failed to set current type, hr 0xc00d4650.
mf.c:3053: Test failed: Unexpected instance.
mf.c:3125: Test failed: Failed to get interface, hr 0.

Windows 10 1507:
mf.c:3017: Test failed: Unexpected hr 0.
mf.c:3049: Test failed: Failed to set current type, hr 0xc00d4650.
mf.c:3053: Test failed: Unexpected instance.
mf.c:3125: Test failed: Failed to get interface, hr 0.

Windows 10 1809:
mf.c:3017: Test failed: Unexpected hr 0.

This is sort of consistent across all versions. So I feel like Wine is
currently mimicking behaviour that holds only for some random media type which
happens to not work on Windows 7 (Wine currently only has one media type
available from GetMediaTypeByIndex).

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