.FW4 File

The fw4 file extension was also used for one of the default file formats in Framework IV development tools. Seems old format as the latest version of Framework is IX.

This fw4 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.

How to open:

Probably not meant to be accessed by the user.

How to convert:

There is probably no real way how you can convert this particular file type to anything else.