Hi Gregor,
Both ways will work. If you click the button on the "isometric drawing generation" window, C2Isogen will start the notepad and open the pcf file. If you use window explorer, you can use any editor you want. You can modify the pcf file if you know what you are doing. CAESAR II has this feature so that experienced user can generate the isometric drawing with his own annotations and components.
Regards,
Shawn
szhong@coade.com
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Shawn Zhong
CADWorx & Analysis Solutions
Intergraph Process, Power, & Marine