Maps created in MindGenius 3.8 and later are compatible with each other. MindGenius 3.8 and later use the file format (.mgmx) which is not compatible with earlier versions you can continue to use the older file format with newer versions of MindGenius.
Save Files in Older Format:
To save files in the older format, select “save as” and then pick “MindGenius2-3 Documents (*.mgmf)” from the file type list: