DVD-Video Disc Information File
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What is an IFO file?
An IFO file consists of headers that tell the DVD player what screen to show at startup, where each chapter starts, where audio tracks are located on the disc, etc. IFO files are often located with VOB and .BUP files on a DVD.
Common IFO Filenames
VIDEO_TS_.IFO - The name of the main IFO file that will play an entire DVD if opened.