I have found a bug in 3.0.0 and 3.0.1 both x32 and x64. This bug does not exist in 2.2.8.

Take some move like mp4 or webm or avi (i have not tested any more) and rename to .mp4.vlc - just to make this file open with vlc. (I use MPC-HC for all movies). This extension makes vlc show error and behaive strange before movie plays.

I do not know how to find if someone else has found this bug, or how to report it. Maybe I should not bother.