RAR archive of 47.8 KB tied to the number 08530 with an SC suffix; no brand, model or revision is given in the name. The numbering matches the five-digit scheme used by Wistron for motherboard designs, and sibling files 08530-1 and 08530-2 share almost the same size. The archive probably contains a boardview or related layout data, so extract it and open the file in a suitable viewer. Match the number on the PCB against the file before using it to locate components or trace signals.
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.