MS-96B6 board package in RAR form, about 706 KB, without revision or contents listed in the name. The number fits MSI's MS- scheme, with MS-9xxx codes normally allocated to server, industrial or embedded designs. After extracting with 7-Zip or WinRAR, review the files, which are likely schematic pages. They are useful for tracing supply rails, identifying regulators and protection parts, and checking connector pinouts during diagnosis. Make sure the board in front of you is labelled MS-96B6, as neighbouring codes are separate designs.
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.