Have you tried to import them into Premiere, then Dynamic Link to After Effects? I am not sure how the file type will translate in that instance but maybe with the communication between Premiere and AE you won’t lose the Raw attributes. I am on CC but I am pretty sure you can Dynamic Link in CS6. You will need your files in the timeline but then you just right click on the file and select replace with After Effects comp.
Hopefully that will help. If not maybe someone else will chime in.
Curtis