Yes agreed and thats what I worked towards with the default C90 in XP. My concern was buying this KA 350 and finding they used non standard datarefs (which you allude to in your documentation). The plane 'looks' really good, but if simvim wouldnt work with it (NOT your fault), because of non standard datarefs, then looks alone would not make me buy it. At the $50 price plus currency conversion, makes for an expensive 'experiment' to find out it didnt work with your great piece of software. Which was the reason for my original question. I wanted to see if anyone had tried it yet.