Boardview for the ASUS ET2700I all-in-one desktop, labelled version 1.01G, with board code 59PT0020-MB2A01D stated in the name. The 393 KB RAR archive contains the layout data a viewer needs to show component positions, net connections and pin numbers. It helps a technician trace standby and main power rails, find the power-on circuitry and probe test points without a full schematic. Check the code on the PCB and its 1.01G revision, since a 1.02G version of this board also exists.
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 @BoardSchematic. 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.