Version 0.A schematic for the MSI MS-1313 board, revision 0A, carrying a 2006 date in the name and packed in a 1.01 MB RAR file. It appears to be an earlier issue than the 2007-dated copy of the same version, so details may differ between the two. Technicians use such diagrams to trace standby and main rails, locate MOSFETs and fuses on a shorted line, and check enable signals. Because pre-release documents may not match production boards, verify the markings on your PCB and cross-check critical values.
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.