RAR archive of 1.96 MB for the Compal LA-3631P mainboard, with the name linking it to A210 and A215 models. The brand is not stated in the name, and the package contents are not described. Compal uses the LA-xxxxP pattern for notebook boards it manufactures for different vendors, so the code on the PCB should be confirmed first. Expect schematic or boardview material useful for tracing rails, checking power sequencing and locating components. Verify the board revision matches before measuring.
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 @alischematics. 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.