FYI from the Full Disclosure mailing list- re: WMF  

"Preliminary testing reveals that emails containing WMF files can be
blocked by filtering for the MIME-encoded WMF header.  This approach
works even if the file is called WORD.DOC.  The string to check for
is:  

183GmgAA

These 8 bytes appear as the first 8 bytes of a MIME-encoded WMF.  
Thus, blocking all emails with those bytes in will block all emails
containing WMFs.  

This technique can be used with common spam filters.  

Regarding web-based WMFs, of the three browsers on this system, only IE
knows what to do with WMFs."



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