Archive in RAR format, 105 KB, for motherboard 10210-1, a number matching the Wistron pattern. The name gives no brand, model or content type; the size suggests boardview data. Unpack it and check what is inside before use. A boardview of this kind opens in viewers such as OpenBoardView and helps locate components, nets and test pads during diagnosis. Be careful not to confuse it with 10211-1, and confirm the number printed on the board matches exactly.
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 @cyberlanelectonik. 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)