Hi Dan,
All what have been said of PlaySound and BarryTheCrab are correct .... but be aware to keep the version of PDR with witch you created the project.
There is no guarantee that coming versions will be able to recreate the project in the same way as when you packed it even if all files are present.
I had to start over with animated titles, PiP and Particles with an older project created and packed with PDR11 - which I wanted to finish it with PDR14 - containing animated titles, PiP and Particles. All files were present - also all the .png's for the animation - but it didn't show in the project. The struckture of packing had changed.
Cheers, Anja
PDR 14.0.4207.0 / Windows 10 64-bit / Asus / Intel i7-4790 3.60 GHz / 16GB RAM / NVIDIA GeForce GTX 970 / DirectX 12