I have been searching the database about "merging" files, and I think I understand it, but still had a few questions.   I have SF2:E and SF2:NA.  I always use my SF2:E exe when playing and have always added mods to the SF2:E save games folders, essentially for lack of knowing any better.   The way I am going I will certainly continue to add  games, and I am in the process of downloading Israel.  My understanding is if I keep doing what I am doing, I will still be able to run Israel terrain/aircraft/campaigns from within my SF2:E exe.   My question is: is there any advantage to adding the SF2:NA and SF2:I exe's to my desktop, and adding mods directly to those save game folders, instead of using the Europe exe?  The way I'm doing it seems simpler but I have read differing opinions while searching the boards.   Thanks.   Chuck