about .btg files

hi,
how to read .btg files as its in binary format. I m trying to put X-Plane terrain in FlightGear. X-Plane contains .ter files in Windows and FlightGear contains .stg files in Linux. In X-Plane .dsf is in binary format and in FlightGear its .btg. I converted .dsf files into .txt format for my understanding and now my next aim is to convert .btg into .txt format. I want to knw how to convert the file. Is there any tool for conversion so that i can proceed further.

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