Small 115 KB RAR archive called H0222-SC, with no brand, model or file type given. It belongs to a group of files sharing the H0222 code, and SC may denote a schematic or a variant, though that cannot be confirmed from the name alone. Open the archive and check what it contains, then compare any board number or revision listed inside against the motherboard. Only after a match should it be used for tracing rails, checking components or finding test points.
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.
7-ZipWinRARThe Unarchiver (macOS)