Hi Vewax,
Mendix does not have a built-in feature to generate PowerPoint files out of the box.
However, you can achieve this in a few ways:
Use a Java Library, Check these references for how to do it:
Call an External ServiceConsume a REST API from a service that generates PowerPoint files . Mendix can call this API and store the returned file as a FileDocument.
Convert an Existing Document. Generate a standard Mendix file (like PDF or DOCX) and use this Marketplace module to convert it into a PowerPoint document:
Hope this helps!