Compressed RAR package for the Lenovo ThinkPad R60, about 1.53 MB. Only the model appears in the name, so no board number, revision or contents list is given. Archives of this kind usually carry service schematics or boardview data used to follow voltage rails, identify test points and find the component behind a no-power or short-circuit fault. Open it with any RAR-capable extractor and compare the board number silkscreened on the motherboard with the one in the documents, since R60 units shipped with several board variants.
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.