MSI B85M PRO-VD desktop board, internal number MS-7A01, revision 1.1, provided as a 780 KB RAR. The B85M naming indicates the Intel B85 chipset in a micro-ATX form factor. The archive most likely carries a schematic for tracing the VRM, SATA, USB and Super I/O sections, or possibly a BIOS image. If it contains firmware, back up the original SPI chip with a programmer before writing anything. Confirm MS-7A01 and Rev 1.1 on the PCB silkscreen first.
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.
7-ZipWinRARThe Unarchiver (macOS)