Whenever I create a .aec file in C4D and try and open it it always defaults to Apple's Color to open it. I have done the old trick of selecting 'always open with' and selecting AE and it doesn't seem to save those settings and the next time I try and open it defaults back to the Color suggestion.
In the Finder, Get Info (Cmd-I) on an .AEC file. There's an "Open with" section of the information panel. Change the default application to After Effects, and then click the "Change all..." button.
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Strangely it was already set to AE as the default in the get info window so I just clicked on the drop down selection to see what else was in there I went out of that widow and tried opening the file again and it then defaulted to AE to open them files..........so it worked;-)