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You should be able to find the file 'user.config' in 'Users\<user>\AppData\Local\Peter_Memmott\JoinFS-XPLANE.exe_*****\1.0.0.0\. Manually edit the file and change the entry for 'XPlaneFolder'. That should fix it. Peter Thanks Peter, that was not exactly the solution but gave me a cue to better sear...

I put by error a not valid char in specification of XPLANE folder path. JoinFS crashed, and now, event unistalling and rebooting before installing again, I am not more able to start JoinFS. Here the error I got from event log on Windows: Applicazione: JoinFS-XPLANE.exe Versione framework: v4.0.30319...