hell all we'd have to do is add an optional string that the new parser is designed to handel and the origonal one isn't and have fred write it every time,
but for now I beleve there isn't anything default that we have changed, so in order to use some new code change there is going to be something in the mission that the old fred or FS2 can't handel,
for example, the beam free default thing adds a line to the mission file that normal FS2 will go ape**** over,
seeing as the backward compatability we have been trying to maintaine is only alowing the new exe to read old missions and not the other way around it is likely that something will happen sooner or later that makes FSO missions totaly unplayable on origonal FS2, if it hasn't happened already.