If it is sitting in C:\Windows\System32 , it is trying to pass as a system file.
If you suspect the file is malicious or if it appeared out of nowhere, do not double-click or try to run any executable associated with it. Upload the file to VirusTotal .
If it is sitting in C:\Program Files\Common Files or a specific game folder (like a custom mod or a game engine component), it is highly likely a safe, functional part of that program.
Look for fields like , Company , or Product name . This will usually tell you exactly what software depends on it. 3. Inspect the File Location
This free service scans the file against over 70 different antivirus engines and will tell you if any have flagged it as malicious. 2. Check the File Properties
You can often find out who made the file and what it belongs to by checking its metadata: on Moon2_.dll and select Properties . Go to the Details tab.