An archive of repair files. Shared as “BBK 40LEX-5056 FT2C CV338H-T42 USB.rar” — a .rar file, 257 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 @tvcodeservice. 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)