Hi Paul, can you e-mail me at moi@moi3d.com ?

I will send you back a special test version with some extra debugging stuff enabled in it which will let me know exactly what is being returned from the file open dialog.

MoI looks at the file extension of the returned filename to decide which file type to write, and from the symptoms that you describe it seems like that is what is going wrong for you.

One last thing you may try is to not touch the file type dropdown at all, and to only just type in the file name and file extension only, like type in : part1.lwo without actually changing anything in the dropdown.

There is a little bit of custom code that MoI uses for when you change the dropdown to update the filename, but maybe somehow some other software on your system is interacting with that in some unforseen way.

- Michael