A schematic diagram for ASUS hardware. Shared as “ASUS_PRIME_B550_PLUS_1_01X_60MB14U0_MB0A02_Device_Bitmap_PDF_.rar” — a .rar file, 1.19 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 @generalbios. 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)