Archive of 156 KB tied to the P8B75-V at what appears to be revision 2.01, packed as RAR with no further detail in the name. Its size fits layout or diagnostic data more than a BIOS image, so verify the contents after extraction. Separate files exist for revisions 1.00, 2.00 and 2.04 of the same board, and components can shift between them. Compare the revision silkscreened on the motherboard with this one before using it to locate parts, trace nets or measure rails during repair.
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 @schematicslaptop. 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.