Thanks for your inquiry. Could you please attach your input Word document, you're getting problems with, here for testing? I will investigate the issue on my side and provide you more information.
Thanks
for the additional information. While using latest Aspose.Words 11.2.0. I managed to reproduce this problem on my side. I have logged your issue as WORDSNET-6173 into our
bug tracking system. Your request has also been linked to the appropriate
issue. Once we sort it out, we will let you know. Sorry for inconvenience.
This issue occurs because Aspose.Words does not provide public API for retrieving theme information. We will inform you as soon as this feature is available.
In the mean time, the work around is, as you found, to convert the document to DOC format first and then retrieve the font settings.