HP 15 archive for Compal board LA-A992P, a Compal design sold under the HP brand, as the LA-xxxxP numbering shows. At 330 KB the RAR most likely holds a BIOS dump for reprogramming the SPI flash. Use a programmer, save the original contents first, and check that the LA number on the motherboard matches. The HP 15 name covered many different boards, so the board code, not the model name, decides whether a file fits.
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)