I Cannot Associate Oxygen XML Author With a File Type on My Windows Computer

I cannot associate the Oxygen XML Author application with a file type on my Windows computer by right clicking on a file in Windows Explorer, selecting Open With > Choose Program and browsing to the file oxygenAuthor13.2.exe . When I select the file oxygenAuthor13.2.exe in the Windows file browser dialog the Oxygen XML Author application is not added to the list of applications in the Open With dialog. What can I do?

The problem is due to some garbage Windows registry entries remained from versions of Oxygen XML Author older than version 9.0. Please uninstall all your installed versions of Oxygen XML Author and run a registry cleaner application for cleaning these older entries. After that just reinstall your current version of Oxygen XML Author and try again to create the file association.