Boardview for the K42JC motherboard, revision 2.0, in .fz format packed inside a ZIP. FZ is the boardview format associated with ASUS boards and opens in FlexBoardView, OpenBoardView or similar software. The 132 KB file maps component positions, nets and test points, which speeds up locating a shorted part or measuring a specific rail. Make sure the board is marked K42JC rev 2.0 before relying on part placement, as other revisions can vary.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip