RAR files are usually safe to use. But just like regular files, compressed files (RAR or ZIP) can also contain viruses or malware. Need to open, create, or convert a RAR file? - WinZip
Are you having trouble with a in Forza Horizon 5, or How to Open RAR Files on Windows, Mac, and Mobile - Avast FH5_Fix_Repair_Steam_V2_Generic.rar
: Refers to a patch designed to "repair" or bypass game limitations, often specifically for multiplayer connectivity. RAR files are usually safe to use