RAR archive of 4.55 MB labelled only g780, with no brand, document type or board revision stated in the name. The label might refer to a model code, but the contents should be inspected after extraction to identify the device and whether it holds schematics, a boardview or firmware. Before using any data inside, compare the markings on the board with the documents, and if a firmware image is included, back up the original chip and confirm the image size fits 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 @uzb4422. 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)