Is it possible to pull the program back out of a SCADAPack 334E and open it with Workbench?

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Yes you can Upload a Project from SCADAPack E to the workbench Program as instructed below

Uploading a Project from the Target to the Workbench

The SCADAPack Workbench allows a project's source to be retrieved from the IEC 61131-3 target if it was originally build with the Embedded Zip Source resource property.

Please find attached more details from CAM5 Help