Improve content type detection for .dotx, .ai, and others. #2705
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To correctly detect content type of file in some cases file extension should be used in addition to magic detection. Such cases include custom extensions with .zip contents, .dotx / .docx files which have same magic signature, and others.
This approach keeps protection from spoofing intact, which would not be guaranteed if
Marcel::MimeType.for
were used.This should also resolve issues described in #2704