RAR archive of 1.6 MB for the Lenovo IdeaPad 100 series, with the name noting LCFC and the NM prefix but no full board number. LCFC is Lenovo's manufacturing unit and labels mainboards NM- followed by a code such as A or B series. Several 100-series models use different boards, so open the archive and match the documents to the number on your PCB. The contents are not stated, but service material like this supports tracing power rails, locating parts and diagnosing no-power or short faults.
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 @alischematics. 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.