The Data selector needs a text file. What you probably have is a spool file printed through a Windows PCL printer driver that contains PCL commands. This is unsuitable for PlanetPress. You are never going to be able to use a PDF file in the PlanetPress data selector for the same reason - its not a text file.
As maltif says, to get data from a Windows APP into PlanetPress, you need to print through the Generic/Text Only driver. If you get problems with this you could try TextPrint from
www.stg.com/textprint which is a rep[lacement for the MS generic driver. Again make sure you turn off the Advanced Printing Features.