VLC does not support the audio or video format undf

[Mike]

Almost daily I encounter a new problem with Linux Lite.
Today I decide to play Christmas music saved on my external hard drive and get the following message:
No suitable decoder module: VLC does not support the audio or video format "undf". Unfortunately there is no way for you to fix this.

What audio format are you trying to play? These are all of the formats that VLC currently supports: http://www.videolan.org/vlc/features.html