If any pdd to dwg conversion is even possible, it would be something like export of graphics content between Adobe PhotoDeluxe format (PDD) and DWG format, perhaps export of curves or import of raster data to DWG drawing, or something in-between.
Of course, pdd might be a typo for actual CAD format, but it's very hard to guess which one that would be.
Updated: January 11, 2024