I use an archive / compression utility called ALZip. In the preferences there's a section where I can integrate my antivirus program with ALZip.
For example I open up the archive (in whatever format) then from the menubar (Actions > Scan Archive for Viruses) I am able to scan the contents of the archive file. I understand BitDefender already does that for some file formats, but not all.
I can't seem to get the command line version working (bdc.exe) ...which I think is a problem with ALZip, but is there a way I can integrate the main interface (bdmcon.exe) with ALZip...so that it only scans the inside of the archive and not the whole computer?
Thanks 
Don
P.S.-Just in case you want to see for yourself you can get ALZip free at www.altools.net