RAR archive for the ASUS M4A785TD-V EVO desktop motherboard, an AMD socket AM3 board. The name names the board only, so the archive contents are not stated, but at 247 KB it most likely holds a boardview or similar small repair file, not a full BIOS image. Technicians use such material to locate components, trace power rails and find test points while diagnosing a dead or shorted board. Extract it and check the board revision printed on the PCB before relying on any part placement or values inside.
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 @boardview. 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.