A 428 KB RAR archive for the ASUS ROG Maximus VII Formula board, with no revision or content type given in the name. It most likely holds a boardview, possibly in the .fz format, though that has to be confirmed by unpacking it. Such data helps locate parts, follow VRM and memory rails and find test points on a board that will not post or has a shorted rail. Read the revision label on the PCB and make sure the extracted file covers the same version.
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.
7-ZipWinRARThe Unarchiver (macOS)