Can virus “do his job” in compressed version of the file (for example *.zip). Must I set up Avast to check out compressed version of the file on virus?
zips, rars, etc are archive files and need to be extracted to run. archive files usually don’t need to be scanned on regular scans.
I take it that you are talking about the on-demand scans (as resident scanning is different) ?
Archive (zip, rar, etc.) files are by their nature are inert, you need to extract the files and then you have to run them to be a threat. Long before that happens avast’s Standard Shield should have scanned them and before an executable is run that is scanned. Thorough is also by its design very thorough and perhaps a little overkill for routine use, were a Standard scan without archives should be adequate.
Fazio93 and DavidR thanks for your explanations, now it is clear to me!
You’re welcome.