Thanks for your interest in Aspose.Words.
I am afraid, you can not open a simple XML file using Aspose.Words component. However, Aspose.Words provides exhaustive support for different XML-based formats for word processing documents e.g. OOXML, Flat OPC and also Word 2003 XML. For more details, please visit the following link:
Secondly, with Aspose.Words you can easily render any Microsoft Word document (e.g. DOC, DOCX, RTF etc) to PDF format. I would suggest you please read the following article for more details:
Please let us know if you need more information, we are always glad to help you.