Archive file in RAR format, 1.60 MB, carrying board code 4MXSV with the number 10, probably a revision indicator. The name offers no detail about the contents, so expect a schematic, boardview or BIOS image and verify after extraction. Reference material like this is useful for following voltage rails, identifying parts around a fault and locating test pads. Read the code and revision on the motherboard carefully first, because closely related codes in this family belong to different boards.
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 @cyberlanelectonik. 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.