.AC File Extension?

[Sad Max]

Anybody know what kind of 3D app saves out .ac files?

The only .ac extension I have found, is for HTTP embedded files...but our assistant has found a bunch of what claim to be 3D models, with that extension...

 

[milksac]

It may be this app
http://www.inivis.com/

 

[Sad Max]

Yup, that looks like it.

Thanks!