RAR archive, 1.21 MB, for the Quanta ZN2 platform used in the HP TouchSmart 310, an all-in-one desktop. No board revision is given in the name, so read it from the PCB before relying on any values. The package most likely contains the board schematic, which helps when tracing power from the supply input, checking standby and main rails and locating components around a fault. Quanta built boards for HP as well as other brands, and the ZN2 code printed on the PCB is the best way to confirm the match.
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.