Merlin to Project 2013 – Exchanging Files
To exchange Merlin Project files with MS Project users, choose 'File > Export… > MS Project'.
This creates a MS Project XML file.
Project 2013 users open the thus exported XML MS Project files as follows:
Click the 'File' tab.
Click 'New' on the left side of the Project window.
Choose 'New from existing project'
Switch from 'Projects' to 'XML Format'
Navigate to the xml project, select and click on 'Open'
And finally select 'As a new project' in the import wizard of Project 2013.