A 2.78 MB RAR archive for the ASUS Z62HA notebook; the name gives no detail about what is inside, so it may contain a schematic, boardview or other service files. Once unpacked, schematics help trace power rails and signals, while a boardview shows where each component and test point sits. Older ASUS notebooks were commonly built on boards from ODM partners, so check the board number silkscreened on your PCB and its revision against the documents before you work from them.
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 @IT_SERVICE_WORLD. 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.