Files with fwn file extension can be found as export files from FreeWave Network.
FWN file extension - FreeWave network data
What is fwn file? How to open fwn files?
File type specification:
The fwn file extension is used for a special export file type that contains the diagnostic and settings information of the customer network on FreeWave Network platform.
Seems to be obsolete product.
This fwn file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.