Can't open projects from backup

I recently got a new computer and installed jme on it. My projects are stored in dropbox for additional security between backups. After downloading the project folders, none of them are recognized as projects in the jme platform. I select them and click open, but it just takes me to that directory as if it were a regular folder. How does jme recognize a project folder from a regular one? I created additional directories inside the project, but that never caused problems on my old computer.

And nevermind. Apparently I needed the gui builder plugin to open the project. Even though I never actually used that plugin, just had it installed. Hmm. Anyway crisis averted!