: RAR (Roshal Archive). This is a proprietary archive format used for high-ratio data compression and error recovery. Likely Origins
If you did not specifically request or download this file from a trusted source, exercise caution: gf260721-jfue-3-00-part3-rar
gf260721 : Often represents a date (July 21, 2021) or a project code. : RAR (Roshal Archive)