Is this the only way to fix the issue?  I, too, get the same error when attempting to upload a .eps file.  I don't really want to turn off checking but at the same time I don't really want to list each and every extension that is supported just because I can't upload one legit file.  If this is the only way, can you provide a head start and provide me the list of extensions supported by default so I can just add the additional ones to it?

Ed