I have seen the XML file export does try to do this. I have tried using the given solutions such as mm2msp_utf8_ak.xsl and also tried using freeplane.

Both give a xml file but I cannot get it to open in OpenProj. OpenProj does open xml files created in MS project without a problem.

Any ideas will be welcome. I also tried FM v9 to see if it is different but the same happens. I think it is just a smal error in the XLT file?