Can't Associate AE File Types

I am running Adobe Creative Suites CS4 for my company. However, we had a file we needed to open so we also installed After Effects CS5.5.

However, now all the AE files open in CS5.5 and this doesn't work for us as our plugsin are installed in CS4. I've tried several times in Windows 7 to associate AE files back to CS4.I've tried through the Control Panel under Default Programs and the right click context menu by "Open With". The problem is when I nativate to the After Effects.exe for CS4, it WILL NOT load in the Windows menu to allow me to re-associate it. The only option remains CS 5.5.

Any way I can perhaps manualy associate these files by doing some kind of edit in the Registry?

Thanks!