Boardview for the Lenovo LCFC motherboard NM-E691, revision 1.0, packed in a RAR archive. LCFC is the Lenovo-owned manufacturer that numbers boards in the NM-xxxx style. With a boardview, a technician can locate components by reference, follow a net from a connector to its source and find test points for measuring rails or tracing shorts. Extract the archive and open the file in software such as OpenBoardView or FlexBV. Confirm the number and revision printed on the PCB match first.
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 @BoardSchematic. 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.