Video Extensions

Which Video Codecs support the following file extensions:

video_ts
video_ts.ifo
video_ts.vob
vts_01_0
vts_01_0.ifo
vts_01_0.vob
vts_01_1.vob
vts_01_2.vob
vts_01_3.vob
vts_01_4.vob
vts_01_5.vob
audio_ts

Is there any appreciable differece between .mpeg and .mpg?

Is so, what?

Thanks.

Ron Pufall