[Bug 5760] New: "Save As", "Open" dialog windows show blank field when dealing with .mus, .mid files

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=5760

Summary: "Save As", "Open" dialog windows show blank field when
                    dealing with .mus, .mid files
           Product: Wine
           Version: 0.9.16.
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: wine-console
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

While using Finale 2005, the "save as" dialog and similar ones like it show just
a blank space in the "Files of type" field, but only when saving a file, or
trying to load a file of any type.

Interestingly, when exporting a file as a .wav or .mp3, the "Files of type" list
is populated, despite the fact that wineconsole's output shows that the same
function is being used.

Given that it's not a crash, I'll only be attaching wineconsole's output,
especially since Finale 2005 won't load while running WINEDEBUG.