@ Emanuele2024
OK, so Avast finds .cab files, why do you think that is unusual ?
Presumably Avast isn't alerting on these files ?
I'm thinking that for some reason it can't scan them (.cab files can be very large compressed 'cabinet' files) and in some cases Avast can't open then to scan and or they might be considered too large. This would generally be raised in a comment after the scan.
What I'm asking is why your concern about these .cab files outside of you can't find them (if Avast isn't alerting or throwing up an error) ?
Avast will have admin privileges in some scans and this may be why.