Juerg,
Assumtions,
1. As you are providing a service free of charge in support of a commercially available PC application, you obviously have Jeppesen's permission to do so using FliteStar!
2. Again, as you seem to be providing the service free of charge, you would require the performance data free of charge as well...Right??
As someone, probably AeroWinx, is making hard currency from the sale of PS-1, how can you expect a qualified performance engineer to give up his personal time to develop a FliteStar compatible B747-400 performance database when you are obviously not already satisfied with the quality of Jeppesen's own data.
If you were considering suitable renumeration for my efforts, I may be able to assist!!
You know where to find me.
Whooaahh!!!