Thread:Project:Support desk/Special:Export - categories with colons

It would appear that the Special:Export interface won't populate from a category that has a colon in it. On de.wiki I'm trying to get a full export of Kategorie:Wikipedia:Exzellent but as the cat is actually called "Wikipedia:Exzellent" it just returns to the page without having added any articles. Anyone know if it needs a character code or some other workaround to do this?