How to convert a dotx file to docx via poi?

[se...@xyz.de]

I want to convert a dotx file to docx.

I tried the following for this. But there is allways an InvalidOperationException("You can't change the content type of a part.");
Is there any way with the api to do this?



for (PackagePart part : xmlTextExtractor.getDocument().getPackage().getParts()) {
     if (part.getContentType().equals("application/vnd.openxmlformats-officedocument.wordprocessingml.template.main+xml")) {
      part.setContentType( "application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml");
     }
    }









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