Hello Freddy,
I think the best options is to use a web connector to call a external endpoint that would do the conversion for you.
As you are using the universal GUI, you can't really use a windows command to let a local program do the conversion, and i don't think making something in the database is easier than a external endpoint.
@Edo Spijker thanks for the reply, I guess something like that already. I found a nice little tool (jsreports) that allows us to generate various reports and I can call it in a custom component as well as via web connector to retrieve the generated report.
Perhaps an interesting tool voor Thinkwise as an alternative for the quite limited devexpress.