As far as I know, the only way to change extensions for debug/test mode execution is by clicking the Test button in the process build interface. But when you do this for a process with a Listener start shape it tells you that Test Mode is not supported. This makes sense since there is no way to supply a document for a Test execution of a Listener.
However, there is the option to re-run documents from the process explorer in Test Mode. This is very useful, but I am not able to change the extensions for these executions without temporarily changing the start shape to not be a Listener. Is there a more convenient way to change the extensions for a Test Mode execution?