Searching for "file3012.rar" suggests it is likely a specific file you have encountered online or in an email, rather than a well-known program or legitimate system file. Because it is an archive format (.rar), it is often used to bundle multiple files or compress large ones.
: If you did not expect to receive this file or it came from an unknown source (like an unsolicited email), it is safer to delete it without extracting. Safe Handling Guide If you must investigate the file, use these precautions: How to Open RAR Files on Windows, Mac, and Mobile - Avast Download file3012 rar
: RAR (Roshal Archive) is a proprietary format used for data compression and archiving . Searching for "file3012