Gigabyte X299 AORUS Gaming 3 boardview, revision 1.0, stored in a 1.45 MB rar archive. X299 is the Intel chipset named in the model, used for high-end desktop processors. Gigabyte prints the revision on the board, often near the PCIe slots, so make sure it reads 1.0 before trusting the placement. A boardview tool lets you find VRM phases, the BIOS chip and test points, trace CPU and memory power rails, and locate a shorted component on this large board.
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 @BoardSchematic. 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)