Mislabeled binary fileextension
I recently uploaded
As Malware.exe.bin because i keep them that way on my drive to reduce the "shoot yourself in the foot" factor.
I am not sure if your virusscanner is able to process it that way: "Magic File Type" is labeled as "Data" and not "MS-DOS executable PE for MS Windows (GUI) Intel 80386 32-bit" as it should be.
Just an idea, make it possible to submit files as ".exe.bin" and let the uploadscript rename it to ".exe".