MSI MS-7050 desktop motherboard material in a 1.15 MB RAR archive, with 130 in the name probably indicating revision 1.3. MS-70xx is the MSI numbering for its desktop boards of that generation. Likely a schematic useful for tracing CPU core voltage, memory and chipset rails, power button and reset circuitry. Read the revision silkscreened on the PCB and make sure it matches before trusting component values or locations, because MSI often changed parts between revisions.
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 @generalschematics. 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.