any imported graems should be fine, as they're "added" and not the "stock" they won't be over-written.
It's not the importers job to do that, it's you uploading files to the server. Just don't upload those directories (in fact, when I extract the archive on my hard drive I delete these folders as a first step).
I always say that!
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Mark, check it out, she said she missed me :x