All my apps are missing?

Looking in iTunes at my apps they all have the ! next to them as they are missing. However they are all located in the mobile applications folder. I'm having to locate my apps within itunes. (click on app, browse through my music, itunes music, mobile apps and search for the app, select it and all is good.)

That being said.. I have hundreds of iphone apps.. Is there a quicker way to locating all my apps? I tried removing my mobile applications folder, restarting and adding it back.