Compressed RAR package for the ASUS F1A75-M PRO micro-ATX motherboard, 472 KB. The file name gives only the model, so the archive could hold a firmware image, a boardview or other service data. Extract it with 7-Zip or WinRAR to find out. For a BIOS dump, read and save the existing flash contents with a programmer such as a CH341A first. Check that the image size matches the chip capacity, and that the board silkscreen reads F1A75-M PRO and not a similar variant.
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.
7-ZipWinRARThe Unarchiver (macOS)