Where are 3DVista VT PRO Projects stored?
The internal projects are stored in the next path:
Windows -> C:/Users/USERNAME/AppData/Roaming/tdv.show/Local Store/
Mac -> /Users/USERNAME/Library/Application Support/tdv.show/Local Store/
It contains random folder names. Each folder is a project where that contains the VTP file, cached files, etc…
You can double click in the project.vtp file to save the project in the initial view.