MSI KM4AM-V desktop motherboard, internal number MS-7061, provided as a 1.19 MB RAR archive. The name gives no revision, so compare the PCB marking against the document. MSI uses the MS-7xxx pattern for its desktop boards, and the KM4 naming points to a VIA KM400-based platform. The archive probably holds a schematic for tracing the VRM, memory supply and standby rails, or possibly a BIOS image. If it contains firmware, dump the original chip with a programmer before reflashing.
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 @IT_SERVICE_WORLD. 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.