Hi Lewis, as far as I know STP files can only be plain text files and cannot contain any ZIP type compression in them, so it's not possible to have settings for that.

The file size increase is probably due to expansion of instances into individual objects - MoI does not currently have any instancing mechanism in it so if the STP file contains a lot of repeated instanced data, at import time into MoI those instance copies are converted into full copied objects and that's probably what resulted in the file size increase.

I do want to add an instancing mechanism into MoI in the future to preserve them and avoid this from happening.

- Michael