Are you using Illustrator or Photoshop? From what I understand, you need to use Illustrator (not sure about versions) to be able to export the metafile (EMF or WMF), which is the file type necessary for that transparency you seek.
Once you have your file, you should be able to do: Edit > Paste from File > Import metafile.
In any case, if you're still having trouble getting your file into PAC Display, I'd recommend contacting PSG.
Hope that helps!