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How to create a new PresentationEx?

How can I create a new PresentationEx? The PresentationEx constructor only allows creating the presentationEx from an existing file or stream

Presentation presentation = new Presentation(); // creates a new presentation not available yet on the file system
PresentationEx presentationEx = new PresentationEx(); // this is not possible. I can only create a new presentationEx from an existing presentation.

Thanks and regards

Hello,

Use pptx presentation with one empty slide. Add it to a resources or simply open from disk.
Result will be absolutely the same like using constructor without parameters.