Boardview in BRD format for a board labelled R23-MB-D, compressed into a 128 KB RAR. No brand is stated, and the label alone does not identify the device. BRD files open in OpenBoardView, FlexBV and similar programs, where you can search parts by designator, follow nets and locate test points. Before using it, check that the board marking and revision on your PCB match R23-MB-D exactly, because similar boards may place parts differently.
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 @schematiclaptopramkushwaha. 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)