Maybe it has something to do with the unpacking engine ?

Bit defender knows these archives : ACE,ARJ,CAB,LHA,RAR,ZIP

these unpackers : Aspack,Neolite,Petite,Pklite32,shrink,Upx,wwPack32

AVAST!4 knows : Zip,Mime,Mapi,Ntfs,Rar,Arj,Tar,Gzip,Cab(only Pro),self extracting exe’s.

It’s possibel i forgot some…Don’t blame me. ( did my best :))

so there’s seems to be some difference between those 2…

I’m curious about the responce of a AVAST support member on this one…

Waldo