RAR archive of about 5.39 MB for the Compal LA-C311P laptop motherboard; the name does not say what is inside, so it may hold a schematic, boardview or BIOS files. LA- followed by digits and a letter is Compal's numbering pattern for notebook boards built for brands such as Lenovo, Dell, HP and Acer. Extract it and check each file: PDFs open in any reader, boardviews in OpenBoardView or FlexBV. Match the LA number and revision printed on the PCB, and back up the original SPI chip before flashing any dump.
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 @boardview. 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.