An archive of repair files for Lenovo hardware (board NM-A273). Shared as “ACLUA-ACLUB NM-A273 (REV 1.0) (2013-12-27).rar” — a .rar file, 3.08 MB.
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 @Satale_bios_esquemas_Laptop. 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.
7-ZipWinRARThe Unarchiver (macOS)