VLC tries but fails...

[Manlove]

...to open a file on my computer that I have not asked it to open.
Somewhere along the line in the last day or two VLC has decided to try to open a .dat file, and it throws up this error message upon failing to do so:
"No suitable decoder module
VLC does not support the audio or video format "undf". Unfortunately there is no way for you to fix this."

I tried to find the file it speaks of, but have thus far failed.
Can anyone shed any light for me?
Thanks.

[bazookaman]

[Chakravartin]

Remove this file:

~/Library/Preferences/org.videolan.vlc.plist

[Manlove]

Thank you Chakravartin.
And yes, that is where I got my moniker!