3D Binary is normal binary data format, which will be used as default format (vector files, field books, terrain models, profiles, etc.). Format will be recognized automatically when opening a file.
All the features in 3D-software are supported and as a binary format it is very fast.
3dVer5-formats write older 3D-Win version 5 file format. Reading recognizes and reads old version 4 and 5 files automatically.