3

You could also check the offending/suspect file at: VirusTotal - Multi engine on-line virus scanner. You can’t do this with the file in the chest, you will need to move it out. I feel virustotal is better as it uses the windows version of avast (more packers supported) and there are currently 29 different scanners.

If it is indeed a false positive, add it to the exclusions lists (Standard Shield, Customize, Advanced and Program Settings, Exclusions) and periodically check it (scan it in the chest), there should still be a copy in the chest even though you restored it to the original location. When it is no longer detected then you can also remove it from the Standard Shield and Program Settings, exclusions.