Whats the format of InstantTracks database files?
The format of these files is not documented. It may change from version to version of InstantTrack. It did in fact change with version 1.50. If you want to automate changes to the IT.ORB database of satellite elements, consider using the new automation features in InstantTrack 1.50 instead of writing your own program. It is now possible to have InstantTrack read an element file under command-line control, or look for an element file named in IT.INI on startup.