Hi,
Is there any way of obtaining information from a design file about who was the last licensee to save/open it?
If you activate and utilize the "Design History" tool, you will be able to gain access to this information. It will also give you the ability to restore to a prior state as all changes will be versioned.
https://docs.bentley.com/LiveContent/web/Promis.e%20Help-v10/en/DesignHistory.html
https://communities.bentley.com/products/microstation/b/microstation_blog/posts/using-design-history-in-your-projects-to-track-changes