A schematic diagram for Lenovo hardware (board LA-K481P). Shared as “Ideapad 5 Pro - 14ITL6 - LA-K481P REV1B PDF.rar” — a .rar file, 5.37 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 @pkbiosbdv. 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)