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It's unclear in the File Type template, if extensions should be entered as ".foo" or "foo" - the wizard will accept either, but probably we don't want to allow defining a loader that will recognize "..foo" files. Would be better not to allow a leading .
Do you know any real file extension with dot (..foo)?
for me to fix
i've improved the validation regexp pattern, so "..xxx" or ".xxx.bleh" are not allowed anymore.
verified