This problem has already occupied me. Also settings of presets are lost by installing new versions.
I have already tried to open the cwp-files in a hex-editor.
The only way is to save the presets as a file.
Sound engineers often render the instruments as an audio-track. So nothing is lost, if you want to remix a song after 10 years.
If an instrument must be played again you have the MIDI-track and you can search a similar sound on an other instrument on the basis of the audiotrack. But this advice comes too late.