Compressed RAR file of 119 KB identified only by code 08212 and the suffix sb. The number fits the Wistron project scheme, and other files in the set link 08212 boards to the Dell Inspiron 1545, though this name itself does not state a model. Contents are unspecified, so extract it and check whether it is a firmware image or documentation. If it is a dump, confirm the board label, read and store the original chip, and verify the size matches the flash device before programming.
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 @schematicslaptop. 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.