Archive labelled simply Z65, packed as RAR and 1.27 MB in size. Apart from the model or board designation, the name carries no detail on revision or contents. Expect repair documentation or a firmware image inside, and check it after extracting with WinRAR or 7-Zip. A schematic would let you follow signal paths and power rails, while a dump would be written to the BIOS chip with a programmer. Check the board number and revision on the PCB, and back up the existing chip contents before writing.
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.