Second copy of the Lenovo ThinkPad W700 DDR3 archive, identical in size at 2.12 MB and packed as RAR. The name marks the DDR3 memory variant but gives no board number, revision or document type. Extract it and compare it with the board you are repairing, since memory generation affects the supply circuits and slot pinout. Such files are typically used to trace rails from the charger through the CPU and memory regulators, find measurement points and narrow down shorted parts on a board that will not start.
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 @generalschematics. 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.