RAR archive of roughly 1 MB for the Lenovo ThinkPad X201i on Wistron board 08270-1. The file name gives no hint of the exact content, which may be a schematic, boardview or other service data. The trailing -1 is the revision in Wistron's numbering, distinct from the 08270-2 board, so the two should not be mixed up when comparing circuits. Extract and inspect the files, then verify the board number silkscreened on the PCB before using it to trace power rails, check shorts or identify components.
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.