RAR archive of 12.6 MB named day11, which gives no device, brand or board information, so it may be part of a training series or course material. The contents are unknown until opened and could include schematics, guides or firmware. Treat it as unidentified: inspect each file, look for board numbers inside schematics or boardviews, and match them against the PCB before relying on anything for diagnosis or reflashing a BIOS chip.
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 @hrtechno. 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)