ZIP archive of 776 KB for the Lenovo ThinkPad T60, with no board number, revision or content description in the name. It probably holds schematic pages, but extract it to check what is actually present. Such files are used to trace power rails from the DC input, review charger and CPU regulator circuits, find test points and work out which component pulls a rail to ground. The T60 existed with several mainboard versions, so compare the markings on your PCB with the drawings first.
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 .zip file
Compressed archive that every operating system opens without extra software.