Compressed RAR package of 1.62 MB for the Lenovo board coded VIUX1, motherboard NM-A091 revision 1.0, dated 2013-04-17 in the name. The NM- prefix follows the numbering used by LCFC and Compal for Lenovo designs. The contents are not stated, but such packages usually carry a schematic used to trace power rails, follow signal paths and find components around a short circuit. Verify that the NM-A091 number and revision printed on the PCB match before relying on the values and part references inside.
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.