If you can tell me (full path), what app/game uses it , or whether your antivirus flagged it , I can give a more specific analysis. Otherwise, treat it as unknown – verify before trusting.
If this file is causing issues, you will typically see error messages when Windows starts up or when you open a web browser. Common messages include: catplus.dll
Right-click the Start menu and select or Command Prompt (Admin) . Input sfc /scannow and hit Enter. If you can tell me (full path), what