I have several files ending with .ref that have disappeared from various folders used with Microsoft Train Simulator (MSTS). A few years ago, I switched to avast since other antivirus programs were deleting another file extension used with MSTS. Is there something new added to avast that is deleting *.ref files?
avast do not delete files or do housekeeping in the computer.
avast will automatically move infected files to Chest (quarantine). Can you check if they’re there?