I have not used it, but I see www.logicswap.com has all the tools for format conversion. Nothing is lost in the conversion. Good tools cost money.
We used PADS in the old days, but I only did hand routing on boards up to 50 IC's in the 70's. Back then we did not have any tools, and used 0.1" grid Mylar with coloured pencils and then sent out for digitizing using say 10x scale. The pro's could do a complex board in a few days manually with designated using more of one axis than another and vias to interconnect. If you are truing to minimize via's or keep on one layer, then more powerful tool rules($) are needed.
Unfortunately proprietary greed & averace a.k.a. friendly competition created no industry standard. So Logicswap created many modules. They can design any protocol conversion in a couple weeks.
As Protel file format is proprietary, ""use of this script for purposes other than migrating from Eagle to Protel may be illegal due to copyright laws. The author will not be liable for any illegal use of this script." Author: Alex Galakhov avg6f4(at)umkc.edu
logicswap also has free IDF to 3D PDF online service. to view layout in 3D and rotate inside a PDF.