RAR archive of 215 KB for the ASUS P8B75-M LX desktop motherboard. The name names only the model, without revision or document type, so the contents have to be checked after extraction. Typical material for this board family includes boardviews and schematics, which help with tracing power rails, locating components and diagnosing shorts. The P8B75 series is based on the Intel B75 chipset. Do not confuse this board with the LX PLUS or LE variants, which have different layouts, and match the PCB revision.
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.