RAR archive for a board identified only as L80V, revision R2.1, at a compact 664 KB. The name does not state the brand or what the archive holds, so it may contain a schematic, a boardview or both, and it should be extracted and checked first. Material like this is used to trace power rails, locate components and test points, and work through no-power or short-circuit faults. Confirm that the model and the R2.1 revision silkscreened on the motherboard match before using any measurements or part values taken from 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 @cyberlanelectonik. 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.