Hi Manfred,
I'm not sure if this is what you are looking for. Hope it helps you.
1. Go to Application and User Management work centre.
2. Navigate to Form Template Maintenance View.
3. Show Active Forms and click Go.
4. Select any output document(Example: Purchase Order).
5. Go to Actions from the drop-down select Create E-mail Template.
6. Select HTM/HTML file which can be used as an e-mail template and click Ok.
Note : The System only supports HTM/HTML file format uploads as E-mail Template.
Best Regards,
Fabio