RAR archive of 2.41 MB labelled ITX-M2F version 2A, which probably refers to an ITX-format motherboard model and its revision. The name does not describe the contents, which could be BIOS firmware, drivers or manuals. Extract it and inspect the files before use. If a BIOS image is included, check that the board model and the 2A revision printed on the PCB match. Back up the current flash chip before writing, and confirm the image size equals the chip capacity, otherwise the programmer will reject 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 @hrtechno. 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.