RAR archive for the Lenovo C510m, 1.77 MB in size. The name carries only the model and gives no board number, revision or document type, so the contents must be inspected after extraction. Files of this kind are generally schematics or boardviews used to trace power circuits, locate components and diagnose a board that will not power on. Compare the board number and revision printed on the mainboard with the documents inside before using them for measurements or ordering parts.
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.