Convert Workflow to DPE 2.x

DPE 2.x supports modern authentication methods. These methods require to forward tokens as an argument to a workflow and as parameter to activities.

This menu option does this automatically for DPE 1.x workflows. Select a workflow from file selection dialog and an workflow with an additional ".Converted" in the name will be created. Also the version will be set to 2.0.0.0.