Small Persian plain-text document of about 19.9 KB, whose title begins with words meaning everything you should, so the full subject is not clear from the name. No device, brand or board is identified. It is probably general notes or a reference text for repair work, and any text editor will open it, though a Unicode-capable one is needed to show the Persian script correctly. Treat it as background reading rather than service data for a particular motherboard.
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 @schematic_mobile5. Enginerys does not host this file.