Small 854 KB rar archive named only after the Lenovo board NM-D151, an LCFC design found in the GV451 and GV551. The name does not reveal what is inside. Its size suggests a boardview or a compact document rather than a full firmware set. Open it with an unpacker and check the file type, then use a matching viewer if it is a boardview. As always, confirm that NM-D151 and its revision appear on the mainboard silkscreen before relying on component positions or values.
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.