Using Aspose.Words 9.7.0 from a .Net application we read an HTML file and export it to PDF.
Thank you for your inquiry.
I managed to reproduce your problem on my side. I created the appropriate issue in our defect database. Once the problem is resolved you will be notified immediately.
Good idea. We've fixed it so Document.BuiltInDocumentProperties.NameOfApplication will get to the PDF Application field.
This will come out in Aspose.Words 10.2 at end of June.