Do not know about MPW files. Need to test this out. But remember a MPW files gives the person who downloads it the ability to make changes and create patterns as his own. I have no complaint with this, just letting everyone know. Fact is if you design a pattern you need to make a MPW of it, so later on if your computer ID changes, you can still open and edit the patterns yourself. (Unless you have made the pattern and imported using STL importer)