If you've found this file on your server or within a project folder, you’re likely asking two questions: What is it? and Can I delete it? 1. Decoding the Filename The structure of 1621058650.vac gives us two major clues:

Used for quarantined items or temporary scan data.

head -n 20 1621058650.vac If it’s a log or a configuration file, the first few lines will usually contain a header or a program name. 3. Is it Safe to Delete?

While not a common everyday format like .docx or .jpg , the .vac extension is frequently associated with:

The number 1621058650 is a classic Unix timestamp. It translates to Friday, May 14, 2021, at 11:24:10 PM UTC . This tells us exactly when the file was generated.