RAR archive of 2.87 MB named for the ASUS A7T and A7M, so it apparently covers two models in one package. The name does not say whether it holds schematics, boardviews or firmware, so list the contents first and sort out which file belongs to which model. Service documents like these are used to trace power rails, find components and check signals while diagnosing faults. Check the board number and revision printed on the PCB against each document, and back up any flash chip before writing an image to it.
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.