Compact RAR archive of 275 KB named Vanguard B85, without stating the brand, document type or revision. The name links it to the Vanguard B85 desktop motherboard, but its contents should be checked after unpacking. A file of this size is more likely a boardview or schematic than a full firmware image. If it holds a board layout, use it to find components and test points, and confirm that the revision on the PCB matches before relying on the part positions.
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.
7-ZipWinRARThe Unarchiver (macOS)