An archive of repair files for Lenovo hardware (board NM-C631). Shared as “ThinkPad L14 L15 Gen 1 R17ET42W.rar” — a .rar file, 12.9 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)