Tell you what -- turn your machine OFF. Wait a minute. Turn it back on again. See what happens.
I already did that. I had this problem yesterday, so I shut my computer down for the evening and started it up again today. Still has the same problem. Others in my office are having the same issue.
Then right click on the .aep file, and select the "open with..." option. Look for your new after effects version and make sure that you mark on the "always open this type of files with...", and from then on it should give no problems.
Maybe when opening the file it will say that the project was made on a previous AE version, but often it won't give problems regarding the compositions and all the effects.
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had similar issues with associating the files to my software. my problem is it was associating it with the wrong version. finally I found a few helpful tips and sorted out my problem.
1. click run and in the search type set associations. you will see this
2. type .aep
select it from here
if this does not work, then a registry intervention is required. I had to do this once from this answered response in this thread:I cannot associate files with Adobe Photoshop CC
Did you ever get this issue sorted out? It would be helpful to know so that your experience could guide others.
Thanks so much!