no problem technical.

As for the scanning of extensionless files:
I actually found a file called jpegcompoc.zip here:
http://www.gulftech.org/?node=downloads

It is a picture with the know jpeg exploit, but besides crashing an unpateched IE it does not do any harm.

Avast detects this “virus” when the picture is renamed to a file without extension. So it would also be correctly scanned and detected in the firefox cache. It is detected as “MS04-028 JPEG Exploit”

So besides the ? extension, I will also add jp*,jif,jfif to the scanned extensions list. Or maybe just j*