[1/4] winmm/tests: Add tests for mmioOpen for the file name of the form EXAMPLE.EXT+ABC.

[Alexander Puzankov]

Ok, I missed that MSDN says that the first parameter of the custom I/O procedure
is of type LPSTR instead of LPMMIOINFO (could be this an error in the
documentation?). I can make cast in mmio_test_IOProc instead, something like:

static LRESULT CALLBACK mmio_test_IOProc(LPSTR lpMMIOInfo, UINT
uMessage, LPARAM lParam1, LPARAM lParam2)
{
    LPMMIOINFO lpmmioinfo = (LPMMIOINFO) lpMMIOInfo;
    ...
}

So should I remove these casts and resend the entire patchset in the right
order?

Best regards,
Alexander Puzankov