Find a software converter able to convert undf files to mp3 files.
Undefined (UNDF) file types are typically partially downloaded, corrupted, or occasionally labeled as unknown by VLC player.
Unless the file is actually just renamed audio file, there is no way how to convert or recover that to MP3. If you think the file is without any doubt audio, try to rename it to MP3 and play, if that doesn't work then there is really nothing you can do.
Unfortunately, there is no detailed software record in the database for this conversion.
This conversion entry was verified by us and conversion from undf to mp3 was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it can't be done because incompatibility between programs, caused by closed file formats, very limited support or by other problems.
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Additional links: Open undf file, Open mp3 file
UNDF
Files with undf file extension can be typically found as files in some kind of Undefined File Format. Most likely highly specialized.
MP3
The mp3 file extension is traditionally used for one of the most common types of compressed audio files, MP3s, which you can playback using almost any media player.
An mp3 file extension can be also used for simple text files that contain saved game scores from some Bridge card game by Masterpoint.
Files with mp3 file extension may also be found as encrypted files affected by TeslaCrypt 3.0 variant that first appeared in February 2016.
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