Files types supported by the new
video playback engine (photoshop extended cs6)
AI, AIF, AIFF, AC3, ASND, CIN, DPX,
EPS, JFIF, JPE, JPG, JPEG, GIF, ICO,
BMP, DIB, RLE, PSD, PNG, PCT, PICT,
VFW, TGA, ICB, VST, VDA, TIF, TIFF,
MPEG, VOB, MOD, MPE, MPG, M2V,
MPA, MP2, M2A, MPV, M2P, M2T,
M2TS, MTS, TS, M1V, MP4, M4V,
MOV, M4A, AAC, 3GP, AVC, 264, F4V,
FLV, SWF, AVI, 3G2, DIF, DV, WAV,
FLC, FLI, M15, M1A, M1S, M1V, M75,
MPG4, MPM, MXF
For further clarification, the vob files in Bridge opens if I double click it. It does not play when I select a vob file to preview (preview is set to play video files). Also I notice the in the Bridge Preferences>file type associations, vob is not listed as a file type to associate. “Hide undefined file types’ is unchecked at the bottom of the menu which means everything is listed. Since vob is not there I assume Adobe took a little liberty with editable file types?
VOB's (Video Object files) are wrapper, or containers. They usually just contain an MPEG-2 muxed AV Stream, but depending on how/where they were created, the first VOB can also contain DVD Menus, and navigation instructions. Again, depending on how/where they were created, those Menus and navigation instructions might not be 100% DVD-compatible.
This article goes into a lot more detail, and also has links to help one rip the MPEG-2 AV Stream, even from non-DVD-compatible VOB's: http://forums.adobe.com/message/2298534#2298534
My first guess would be that the problem VOB(s), was created by a DVR deck, or by software, that outputs non-DVD-compatible VOB's.
Good luck, and hope that helps,