Visio version='10.0' "The selected VDX file is invalid"

[javadude]

Hi Paul, I've solved my problem and I will post the solution here for other people running into this like me:
My issue was that I used  iso-8859-1  encoding when creating the document in Java code using javax.xml.transform.Transformer, but then later on in all the Visio templates and stylesheet I used  utf-8.
It has to be iso-8859-1 everywhere.
Regards