In defect 61, a workaround to get a non-textile markup immediately is described:
Just use the extension "*.mediawiki"
But this does not work directly:
1. The extension is not registered as Textile Editor. Maybe Textile could do
2. Even if the file is opened with the Textile Editor (and the extension is
registered), the menu entry "Textile>" is lacking. So the "Convert to ..."
entries are not available.
Please, could you correct this?