https://www.mediawiki.org/w/index.php?title=Special%3ASearch&search=uploads+windows&go=Vai contains URLs such as https://www.mediawiki.org/wiki/Manual:Configuring_file_uploads?searchDepth=1
The URL format is incorrect. If parameters are needed, they must be used with standard index.php full url format.
See also https://lists.wikimedia.org/pipermail/wikimedia-search/2015-August/000334.html