Hello, In Oxygen (5.0, 5.1), in the File - Open dialog, by defaults the files displayed are "All supported files (XML, XHTML, ....)". Unfortunately this does not include the file types specified under Preferences/File types. For example, I work primarily with Cocoon, so I open lots of files with extensions .xmap, .xconf, and .xsp. But these files don't show up in the File - Open dialog, unless I change it to show "All Files"... whereupon it also shows many files I don't want to edit. So this is a feature request that the "Files of type" option "All supported files" (the default option) would include file types specified under Preferences/File types. Lars