Archive for the Lenovo B465 notebook in RAR format, 1.58 MB, with no board number, ODM name or revision given. The size is typical of a schematic PDF, but the actual contents can only be confirmed by extracting it with 7-Zip or WinRAR. A technician would use such material to follow power sequencing, measure rails and find the component causing a short. Read the board code from the PCB first and compare it with the documentation inside, since one model may ship on different mainboards.
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 @IT_SERVICE_WORLD. 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.