For some reason my Bridge no longer allows me to open files from within it for Illustrator. Just opening inside Illustrator. It wasn't like that. Before it worked. As I really like Bridge as my favorite search platform, this has become a problem. What happened?
Try resetting the preferences or just check the file type associations in the preferences,
To add to what Melissa suggested, here's how to reset prefs
Rebuild Bringe’s Prefs
First, quit Bridge (if open). Then, when launching Bridge, press Command-Option (Mac)/Control-Alt (Win) + Shift to choose “Reset Preferences”, Purge Entire Thumbnail Cache”, and/or Reset Standard Workspaces.” In your case, chose "Reset Preferences."