If you have a file on your computer you are unsure of and it has been Quarantined by Avast Antivirus, then you can send it for analysis with Avast Threat Labs.

This guide will help you to delete a file to Quarantine in Avast Antivirus.

This guide will help you to restore a file from Quarantine in Avast Antivirus.

If you have a file on your computer you are unsure of, you could add it to Quarantine and then send it for analysis with Avast.