This article is from the DVD Formats FAQ, by jtfrog@usa.net (Jim Taylor) with numerous contributions by others.
In general, no. Current DVD players do not play CD-i (Green Book) discs.
Philips once announced that it would make a DVD player that supported CD-i,
but it has yet to appear. Some people expect Philips to create a "DVD-i"
format in an attempt to breathe a little more life into CD-i (and recover a
bit more of the billion or so dollars they invested in it). A DVD-ROM PC
with a CD-i card should be able to play CD-i discs.
There are also "CD-i movies" that use the CD-i Digital Video format that
was the precursor to Video CD. Early CD-i DV discs won't play on DVD
players or VCD players, but newer CD-i movies, which use standard VCD
format, will play on any player that can play VCDs (see 2.4.5).
See Jorg Kennis' CD-i FAQ for more information on CD-i.
 
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