An archive of repair files. Shared as “A320F u8 repair& patch cert done by Master-Mobile.rar” — a .rar file, 1.64 GB.
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 @mrepairo. 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.