Firmware archive identified only as IPC-A790PS version 1.0, with no brand or device given in the name. The A790 token suggests an AMD 790-series desktop board, but that is not confirmed. The 2.58 MB RAR probably holds a BIOS image for reprogramming the board's flash chip with an external programmer. Check that the model printed on the PCB matches exactly. Save a dump of the existing chip and confirm the extracted file size equals the chip capacity before writing anything.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @biosarchive. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →