ASUS Rampage IV Extreme boardview for revision 1.02B, packed in a 239 KB RAR archive. This X79 enthusiast board has a complex VRM and many power rails, and a boardview helps locate parts, follow nets, find test points and track down a component shorting a rail to ground. The archived layout is usually in an ASUS format that opens in OpenBoardView, FlexBV or a similar viewer. Check that the revision printed on your PCB is 1.02B, as placement may differ on other revisions.
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 @boardview. 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.