Both .fw2 and .fw files come from a tool called Framework and both files are some kind of databases. Unfortunately, we were not able to determine if fw2 to fw conversion requires something special, or is mere resave of the files between different versions.
In any case, it is unlikely that any other software can help you out with this, so if you are facing particular issue or other problem with this export, it would be best to reach out to Framework support.
Updated: October 31, 2023