A (Roshal Archive) file is a proprietary format used for data compression, error recovery, and file spanning.
The file is typically associated with driver software for specific hardware components, most commonly identified in legacy tech forums as a driver for WNT USB/Bluetooth adapters or similar peripheral devices. The "RAR" extension indicates it is a compressed archive that requires extraction before the contents can be used. Understanding the RAR Format Download wntusbtc65 rar
How to install usb network card driver using .rar file? - Linux.org A (Roshal Archive) file is a proprietary format