Manual:$wgProhibitedFileExtensions/pl

Details
Files with these extensions will never be allowed as uploads.

overrides, so you must remove an extension from the blacklist before you can upload files that have it. For instance, to allow users to upload executables, add this to :

This configuration parameter used previously was.

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 * The filename-prefix-blacklist system message defines prohibited prefixes, to avoid non-descriptive (usually camera-generated) filenames.