Archive for the ASUS P8B75-M LX PLUS motherboard, a 190 KB RAR whose name does not specify what is inside. Archives in such collections usually hold repair data such as a boardview, which needs a viewer like OpenBoardView or FlexBV, or a schematic. This board belongs to ASUS's B75 chipset micro-ATX line. Used properly, it helps locate parts, test points and power rails on a dead board. Extract it, identify the document type, and compare the board revision with the PCB marking before working from 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.