I reviewed the atmosphere folder and it appears all the atmosphere are *.iATM file types.
Will 3dxchange 6 pipeline convert import files to this file type?

I haven't found anything on this.
It may be as simple as just changing the extension on specific file types.

I realize there is file type ATM from Vue, but I don't own Vue.
There is a free version - of Vue called Pioneer, which is a free download.
It may be a way to do this, but I thought it worth asking.
I can't afford a $400+ program for a few skies