RAR file coded A980-1-4-01, 842 KB, with no revision, brand or device identified in its name. Without further labels, the contents must be checked before use: extract the archive and read the cover page or headers to see what product and document it covers. If it contains schematics, they can be used to follow power rails and signals; if a layout, to locate parts. Either way, verify the board number and revision on the hardware match the documentation first.
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 @schematicslaptop. 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)