Archive for the K40 model carrying a B suffix, only 121 KB in RAR format. The suffix is not defined in the name, and there is no board number, revision or document type. It sits beside a similarly sized K40 T file, so the two may be companion parts of one set. Unpack it to find out what it holds. Any board data should be matched to the PCB number and revision, and any firmware should be checked for correct size and written only after the original chip is backed up.
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.