I was searching for something in the forum, and happened upon your question.
I'm an AFP/IPDS guru (at least in my own mind), and I have to tell you that the answer to your query is "no" if you are using PlanetPress on a Windows system. IPDS is not a "readable" type of data that PlanetPress would understand (on the iSeries or any platform).
For the iSeries (OS/400), I would recommend that you use SCS as your datatype instead. Usually, you can specify SCS when moving data from your spool. It may require a Host Print Transform object to convert EBCDIC to ASCII for use in your Windows-based PlanetPress Design Tool. And you may run into a few other "gotchas", but that is the place to start.
Best regards,
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Bob Carlyle
Indigo Wolf Solutions, LLC
Charlotte, NC