Compressed RAR file of 1.22 MB for a board identified as 2RS780MH, version 01. The RS780 part of the code suggests an AMD RS780 chipset board, but the name states no brand or exact model, and the archive contents are not listed. Unpack it to see whether it holds a BIOS image or service documentation. Before use, check that the board code and version stamped on the PCB match this one. If you reflash with it, first read and store the original BIOS chip so you can restore it if the image is wrong.
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.