Boardview in BRD format for the MN10AB motherboard, part number 6050A2408901, marked MB revision A02, size 191 KB. Numbers starting with 6050A follow the Inventec style of PCB numbering, also seen on boards built for HP and other brands. Load it in OpenBoardView, FlexBV or a similar tool to search parts by reference designator, highlight nets, and trace power rails or locate test pads. Check that the 6050A number and A02 revision printed on your board match before relying on pin positions.
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 @boardview. Enginerys does not host this file.
How to open a .brd file
The most common boardview extension. Several unrelated formats share it, which is why one viewer opens a .brd and another refuses it.