By detecting the file type instead of just the extension, and allowing configurable actions based on detected filetype, we could avoid future viruses that ask the user to rename the file upon receipt.
But, that prevents people from doing the same for good purposes, too. So you can no longer say "If you rename the .exe file to .xex, it will go through OK".
FWIW, though, we do have some code already written for detection of certain file types (actually, most of the code is backwards, checking to see if a file type is really what the extension claims to be). So it may not be that difficult to add.
-Scott
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