An archive of repair files. Shared as “Acer4752g_PCH_is_damaged,_resulting_in_external_display_and_internal.rar” — a .rar file, 321 KB.
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 @bartonarquivos. 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)