I thought you were talking about some sort of upgrade to the win98 versions for some reason. Too many X-wing/TIE games out to keep track of... They were repackaged so many times. From what I remember, X-Wing didn't get any new missions, just tweaked some of the ones from the floppy version that were too hard or tended to have broken objectives (I think the floppy version had a patch for this).

I never have been able to get back into X-Wing ever since playing TIE. TIE's expanded targeting controls made missions sooooo much easier; you could easily target a ship attacking your target, view a target's shield and hull strength, or see a target's objective. Not having that info made it almost impossible to beat some missions for me without a strat guide for X-Wing.