Boardview for LCFC motherboard NM-C181, revision 1.0, used for the FA391 and FA491 Lenovo projects, packed in a 714 KB RAR. BDV in the name marks the boardview layout. After extraction, open it with OpenBoardView, FlexBV or a similar viewer to find parts, test points and net connections on both sides of the PCB. Pair it with the matching NM-C181 schematic to chase shorts and missing rails quickly, and check that your board carries the same number and revision.
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 @ShareMan_Electronic_Files. 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.