For me nothing…
Definetivelly the scan capability of Home and Pro version were the same as I wrote before but some doubts appear due to the related situation of RejZor…: I tested with EICAR file and it was only detected when not inside ZIP archive (Home Edition). Pro Edition detects inside ZIP and other common archives too.
Yes, but only if he turned on archive scanning in the Resident tasks settings (in avast Enhanced UI).
Do you mean packer’s settings? Why you use ‘archive’?
Btw, when you choose ‘all packers’ the options bellow remain unchecked… I suppose they will scanned as well…
Archives are ZIP,RAR,CAB,ACE files,application packers are UPX,ASPack and so on(you probably know this already 
). The second ones are scanned by Home version too,but for first one we already said how it works.
Yeah if you select “All packers” than even unchecked options below get scanned.
A million thanks! 
But don't tell anyone ;DMy lips are sealed :-X
Hehe this is a secret that no one suppose to talk about :-X
Thanks to everyone for helping me understand the software better. I really like ‘avast!’ 
Does archive scanning slow the computer down considerably?
Is it recommended?
Faffy
Depends!
It really slows the computer but you can run the scanning while you are not using it (screen saver module, for instance). The application must ‘unpack’ the archive file and scan the files. If the archive is big the computer will be stressed in some way…
But you have to enable it at least to be sure that no one file that already is infected. If you do not have RAM problems and your system has some power, you should enable the high protection (at least when you are on-line).
I talked about on-access scanning, not on-demand scanning. I don’t care how much it takes to scan my hard drives during my weekly virus scans, because it is done at nights. My question was regarding to if I enable archive scanning in the on-access module. For example, if I remember correctly Kaspersky warns you if one enables certain scanning features the computer could suffer considerable performance problems.
Faffy
Faffy, the same behavior will occour at on-access scanning… You will have a lack of resources but you must choose the optimal point: resources and protection runs one against the other 8)