While most of them ar good for CAD and can be used to store CAE data (typically from FEA or CFD), they are not optimized for CAE, especially not for time-dependent data and CAE-specific element types.
Based on this insight, Ceetron developed in 2006-2007 VTFx. It is today used by tens of thousands of CAE professionals on a regular basis, and supported by major CAE vendors like Autodesk, Transvalor, and DNV GL.
Its specification can be found here.
If you are a CAE tool provider, you can VTFx-enable your CAE tool with Ceetron Export SDK.
It is a matter of performance and collaboration (and free viewing, ‘free’ like in free beer).