http://bugs.winehq.org/show_bug.cgi?id=21270
--- Comment #6 from Luke gaming4jc2@yahoo.com 2010-01-10 13:06:54 --- (In reply to comment #5)
The installer detects that wmvcore.dll is not present and tries to install it by running a custom action that extracts an installer executable listed in the Binary table.
However, there's a case insensitive match for the filename specified in the query, but no case sensitive match, which is why we fail.
This could still be a bug in the installer that goes unnoticed because this dll is usually present on Windows. Testing that might be challenging though because of the system file protection mechanism.
'winetricks wmp9' works around the bug.
Thanks! B) That got it working for me, though other bugs are popping up in the program itself...