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=== Companion files{{anchor|IFO}} === VOB files may be accompanied with IFO and BUP files. These files respectively have <code>.ifo</code> and <code>.bup</code> filename extensions. IFO (information) files contain all the information a DVD player needs to know about a DVD so that the user can navigate and play all DVD content properly,<ref>AfterDawn.com (2007-07-31) [http://www.afterdawn.com/guides/archive/how_to_play_vob___ifo___bup_files.cfm How to play VOB / IFO / BUP files], Retrieved on 2009-07-26</ref> such as where a chapter starts, where a certain audio or subtitle stream is located, information about menu functions and navigation. BUP (backup) files are exact [[data redundancy|redundant]] copies of IFO files, supplied to help in case of corruption. Video players may not allow DVD navigation when IFO or BUP files are absent.
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