MPK , MPR , MDA

Hello

I have MPK and MPR file, both seem to solve the same purpose. Opening MPK will extract files and open mpr in modeler.

If i onyl have a MPR file and i double click on this, it seems to do same and put all files in same locaiton and open modeler.

Where does the difference come in?If i have to share my project if someone, will i give MPK or MPR file.

In addition , MDA file is also package that will have the same.

ANy one can clear differences for me?

thanks