We've just got CS5 and previuosly had CS3.
In CS3 I edited the interpretation rules txt file to cause imported quicktimes to default to PAL ananmorphic as that is what we nearly always use.
If I wanted to do the same to CS5 is it the same text? Can I just copy and paste?
I don't think that the syntax for the entries in that file has changed between CS3 and CS5, so you should be able to copy and paste individual entries between them. I'm typing this at a computer without After Effects installed, so I can't check to be sure, but I'm mostly certain.
Be sure to make a backup copy of the file before you make any changes, just so that you can revert back if something goes wrong.
I'll do that.