Implements the mime_magic feature absent from some (older and
misconfigured current) PHP interpreter versions.

This is recommended in conjunction with the downloads plugin to
store correct mime type data, for proper use of icons beside
download links. Also the correct Content-Type header should always
be available, when binary content is delivered.
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You cannot modify the README.plugins file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the README.plugins.Discussion.