
Some combinations of compatibility settings should not be used when building a data file, due to differences between different versions of the Ducks engine.

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COMBINATIONS NOT ALLOWED IN v0.4 DATA FILES
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Data files marked as v0.4 compatible should neither add to nor redefine objects. (Yes, I know this combination of settings was used with Xmas Ducks 2000 - just do as I say, not as I do, OK? OK.)

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COMBINATIONS NOT ALLOWED IN v1.0 DATA FILES
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1) Data files marked as v1.0 compatible should not contain rolling demos unless they only use the original object definitions.

2) Data files marked as v1.0 compatible should not redefine objects, as this would cause any rolling demos only compatible with the original objects to play incorrectly. Ducks v1.1 contains additional code to disable playback of any rolling demos inappropriate to the loaded object definitions.

