Elitegroup X58B-A motherboard package, revision B, at 1.75 MB in RAR format. The X58 name corresponds to Intel's X58 chipset platform. The content is not spelled out, but an archive of this size usually carries the full schematic. Use it to trace the VRM, QPI and memory rails, locate test points and narrow down shorts on a dead board. Open with 7-Zip or WinRAR and make sure the PCB is marked revision B, because other revisions of the same model may use different parts or layout.
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.