ASUS all-in-one PC boardview for the ET1620I mainboard, revision 1.2, packed into a 343 KB RAR archive. These compact AIO boards are hard to probe blind, so the layout file earns its keep when you need to locate a component, follow a signal from the power connector to the regulators, or find a good ground and test point while hunting a short. Open the extracted file with a boardview program like OpenBoardView or FlexBV. Compare the revision printed on the PCB with 1.2 before measuring, because ASUS revised this board more than once.
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.