You could also look at it using the Volkslogger Manager for Windows
(free download: http://www.volkslogger.de/de/VL-Manager.exe ), it is a
simplified StrePla. You can import flight data files with the fl2
extension. You can then use it to convert the track file to IGC format
(right click on the track information in the track window, then "save
igc data on disk").