You rarely type file%3A%2F%2F%2F directly. You find it encoded in:
Sometimes curl-url-file-3A-2F-2F-2F appears in: curl-url-file-3A-2F-2F-2F
Example attack payload:
curl "file:///etc/passwd" encoded as curl-url-file-3A-2F-2F-2Fetc-2Fpasswd You rarely type file%3A%2F%2F%2F directly
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