avifil32: allow files with different extensions to be loaded

[Julius Schwartzenberg]

I'm not sure whether this patch should be applied. It changes the 
behavior from what Windows 98 has to what Windows XP has. Windows XP is 
more tolerant with the file extension of an AVI file and can load any 
AVI file no matter it's file extension. With Windows 98 the actual file 
extension needs to be one that's properly registered in the registry.
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