A schematic diagram for Acer hardware (board LA-A621P). Shared as “compal_la-a621p_r0 (1).3_acer_E1_510.pdf.rar” — a .rar file, 1.81 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 @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.
7-ZipWinRARThe Unarchiver (macOS)