: Often bundled with Serial Box updates as an alternative interface for searching the database. 2. How to Open the File
However, that filename suggests it's a ( .sb2 is Scratch 2.0, but .sb2 with that naming pattern often comes from older educational archives). There is no known academic or published paper specifically about a file by that exact name.
The .sb2 extension in this context is a proprietary database format used by specific "reader" applications to display these serial numbers.
: The "03 2013" in the filename indicates this specific database was the update released in March 2013 .