I have read the Readme.txt both Plib and FGFS " model how to " , but I still don`t understand how to use it , it seems I can covernt a MSFS model to a FGFS`s , by using this Plib , I am missing , Could anyone tell me how to do with it ?? My system is Mac OS X 10.3.6 Panther , Really Thanks !!Or could you help me to covern this MSFS An-225 with space shuttle carried to FGFS`s , if it is too difficult to say how to use a Plib but you can use it .This is the An-225 :http://library.avsim.net/download.php?DLID=35457( There are two versions in this pakage : One is An-225 with space shuttle the other is without space shuttle , I like An-225 with shuttle version . )Hope someone can do it .

There should have been a program "threedconvert" coming with your FlightGear distribution. Use it like so:$ threedconvert foo.mdl foo.ac