The latest plugin (which can be downloaded here) for Ultimate Unwrap 3d allows all ETW model files and animation files to be opened, edited and (if necessary) saved as any suitable filetype. (.ms3d, .obj etc).
There are no longer any animation or model files for ETW that cannot be opened
A licensed version of Ultimate Unwrap 3d is needed for these files to be saved - a demo version is available, but it has no saving capability.
Big thanks to hammerdalways for putting me in contact with the tool dev
Pictures: