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[edited by: tedster at 5:26 am (utc) on May 5, 2010]
This is currently a bit awkward, as there is no "Allow" field. The easy way is to put all files to be disallowed into a separate directory, say "stuff", and leave the one file in the level above this directory:
I feel that would be unlikely to be a serious issue here unless for example the site had changed from www to non-www with the relaunch and the www now produces an error.