somehow it has some problems with mozilla mail scanning (did not detect mydoom). these are from mcafee log

D:\Documents and Settings\windows xp\Application Data\Mozilla\Profiles\default\rrmpv20f.slt\Mail\mail\Inbox\0023f3e2.EML … Found the W32/Mydoom.a.eml!zip virus !!!

the inbox in this case (… \Mail\mail\Inbox\0023f3e2.EML) is not a folder but a file (just inbox), mcafee somehow can scan inside it and avast not ?