RAR archive of about 1.01 MB titled for the IBM ThinkPad R32. Beyond the model, the name gives no board number, revision or document type, so inspect the extracted files to see whether they are schematics, boardview data or other service material. For a laptop of this age, a schematic is useful for tracing the power supply chain, identifying failed components and finding test points. Check that the motherboard number on the PCB corresponds to the one in the documentation before taking measurements from it.
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.