RAR archive of 449 KB named only after the ASUS P8B75-V desktop motherboard. The name does not list its contents, which in collections like this are usually service material such as a boardview or schematic for the board. The board uses the Intel B75 chipset. Material like this helps technicians locate components, follow voltage rails and trace faults such as no power or no POST. Open the archive to check the file type and revision, and match it to the revision printed on the PCB 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.