[einhverfr]

I would call the odds "beyond remote."

The chance that you are going to get MSDOS expressive structures in FreeDOS in a way that is even arguably beyond deminimis is nil. You don't usually just move code between implementations easily, and chances are pretty good that the FreeDOS folks use fairly different approaches than the MSDOS folks. The argument is that if you read the code you might be tainted, but I don't see this as a significant argument here for software that's 30 years old.