As a test I loaded Winter Queen in P6 and saved as PZ3 (after uncompressing geometry files using the python script). Closed P6 and opened P5 - added P6 runtime as external runtime. Opened Vue 5 Infinite, loaded PZ3 - no problems!! Of course this doesn't mean that every PZ3 is going to work. Some might use new features that Vue doesn't know about, but it at least proves that the basic PZ3 structure is still compatible. Basic 2 minute render attached.

Mark