An archive of repair files. Shared as “RSAG7.820.4395 Panel LC420WUE (SC) (V1).rar” — a .rar file, 2.55 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 @led_software. 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)