An archive of repair files for HP hardware (board LA-E802P). Shared as “HP 15 bs742TX DKL50 LA-E802P REV-1_0.rar” — a .rar file, 5.44 MB.
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.