RAR archive of 1.02 MB labelled ASUS A7J, with no statement of what it contains. At this size it could be a schematic, a boardview or a BIOS image for the A7J, so extract it and confirm the file types before relying on it. Schematics help trace power-on sequencing and signals, boardviews locate parts and test points, and firmware dumps are written to the flash chip with a programmer. Check the mainboard number and revision on the PCB, and back up the original chip 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 @IT_SERVICE_WORLD. 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.