Archive named for the ASUS Rampage IV Formula motherboard, RAR format, roughly 592 KB. The file name gives no document type or revision, so inspect the contents before use. Material in these packages, typically boardview or schematic data, is used to locate components, probe VRM phases and memory voltages, trace signals around the chipset and identify shorted rails. If a revision number appears inside, match it with the one printed on the board, since layout and part references can change between PCB versions.
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.