An archive of repair files for ASUS hardware. Shared as “Asus_ROG_STRIX_B550_E_GAMING_R1_04X60MB1470_MB0A01_BDVPK.rar” — a .rar file, 186 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 @pkbiosbdv. 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)