Archive of high-resolution photos of the Quanta board DA0X8MMB6D0 revision D, model code X8M with 6L, likely a six-layer PCB. The DA0 prefix with MB is the Quanta mainboard numbering pattern, and the model letters are its project code. At 27.6 MB it is a reference image set rather than a schematic, useful for spotting missing or burnt components, reading part markings and checking original placement when no boardview is available. Make sure the revision on your board is also D before comparing.
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.