RAR archive of 197 KB for the Compal LA-B211P mainboard, revision R10 (1.0) per the name. The contents are not listed. The small size suggests a firmware dump or boardview rather than a full schematic, but extract it to confirm. LA-xxxxP is the Compal ODM numbering pattern, used on notebooks sold by several brands. If it holds a BIOS image, back up the original SPI chip before writing and make sure the image size matches the flash chip capacity.
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)