RAR archive of 119 KB marked 08212 with an sb suffix, sized almost identically to the 08212 boardview files, so it likely contains related layout data. The name names no laptop model, revision or format. The number follows the five-digit style Wistron uses for motherboard projects. Extract the file and open it in a suitable boardview viewer to locate components, check pins and trace nets during diagnosis. Confirm the board number and revision silkscreened on the PCB before trusting any placement shown.
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.