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Yea I put no in double-quotes because there's tricks you can do to "fake it".
But I got the OPs question to mean checking for a file that's not under your control.
(ie a file of your own addon that might or might not be present but you have control over what it contains if it's actually there)
And wowlua has no generic file io capabilities whatsoever so you cannot check for arbitrary files.
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