Files with FEF extension might be found as part of old German accounting software called Steuer2001.

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FEF file - Steuer2001 file

What is fef file? How to open fef files?

The FEF file extension seems to have been used in the past in Steuer2001 program, which was probably a German accounting software. Most likely obsolete file type.

Help how to open:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert:

As far as we know, this .fef file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

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