Robert_Charlton - 9:51 am on Sep 24, 2013 (gmt 0)
The possibility that data files might be playable was one of the "much more to be said" type items that I left not detailed.
I think it depends entirely on the player... or (when on a computer) it may depend on installed software/codecs as well. It's not something that I would count on all Blu-ray players or DVD players to be able to do. It's likely a feature on many new ones, just as some can view jpegs, but it's not part of the DVD spec, which I believe is MPEG-2 only.
As I noted above, it's going to be tough enough to get all DVD players to play duplicated DVDs.
I should mention that we're using the word "region" here in two different ways... region in the generic meaning of the word and applied to geo-regions for NTSC, PAL, and SECAM... and then the 6 worldwide distribution regions set up by studios just for DVDs. I assume that these disks will not specify those distribution regions, as you're not trying to limit compatibility here... you're wanting to be your disks as widely compatible as possible.