Any AIRAC cycle (either from Aerosoft or Navigraph) is consisting of two folders:   1) "NavData" 2) "SIDSTARS"   Within these two folders all the required data files for a certain AIRAC cycle can be found. The first folder "NavData" contains a file named "cycle_info.txt" which can be opened using any text editor (like "Notepad.exe"). In this file one can read the version of the AIRAC cycle. If different cycles are installed on the same machine, this information helps to identify which cycle