Archive named after the ASUS P5KPL-AM desktop motherboard, compressed with RAR at 184 KB, with no type or revision given in the name. Unpack it to determine whether it carries a boardview, schematic or BIOS image. A boardview helps find components by designator and follow nets when chasing a shorted rail, while a BIOS file would be flashed to the SPI chip with a programmer after backing up the original. Make sure your board is the plain AM version rather than the SE variant before relying on it.
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.