The 4.0 version of ZONAIRDemo is provided as a free download on our website. The most popular version of the software is 4.0. This tool was originally developed by ZONA Technology, Inc. The software is included in Photo & Graphics Tools. The ZONAIRDemo installer is commonly called ZONAIRCommand.exe.
From the developer:
ZONAIR is engineering software used to compute steady aerodynamics of a flight vehicle.
You may want to check out more software, such as Riptide, 3D Studio VIZ R3 or P-CAD 2004 Viewer, which might be related to ZONAIRDemo.