RAR archive for the H81-A motherboard, revision R2.0, 217 KB, with no brand given in the name. The model suggests an Intel H81 chipset desktop board, and the small size points to schematic or boardview content rather than a firmware image. Extract it with WinRAR or 7-Zip to confirm what is included. Boardview data helps locate components and test points, while a schematic helps trace VRM and standby rails; either way, check the PCB shows revision 2.0 before relying on 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 @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.