Very small RAR archive of 44.1 KB named OC_PANE; the name is uninformative and gives no brand, model or board number. The token may refer to an overclocking or control panel board, but that cannot be confirmed from the name alone. Extract it and check the actual file type before use. At this size it could be a compact boardview, a small schematic or a firmware fragment. Whatever it holds, match any part numbers or board markings inside with the hardware in hand 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.