Right-click your desired concept model in the Containment tree. Select Concept Modeling > Export to OWL.
A question box will appear asking whether you want to freeze the elements' IRI.
If you click No. The notification window shows this message.
If you click Yes. The notification window shows you which elements' IRI were frozen.
A progress bar will appear.
A dialog will appear asking you to choose the folder to save the exported model into.
A Path Variables dialog will appear. The default path variable is <project.dir>\OWL. Choose Use Selected.
Your concept model is not export into the folder of your choice with the file extension of your choice.
The exported OWL ontology file is saved in a folder named OWL. The OWL folder is created at the same location as the MagicDraw project file containing the concept model.