Using menu item "File > Open..." shows the Qt file dialog with a predefined "Files of type:" filter, which includes "application/x-kig", but no *.kig files are visible in the file dialog. (typing the file name manually lets me open the file). Might be a Qt bug.
Still reproducible after https://phabricator.kde.org/D9057 The behaviour is as follows: - Using standard KDE file dialog (XDG_CURRENT_DESKTOP=kde): Only the "All Files" filter is shown, and a .kig file can be selected - Using default Qt file dialog (XDG_CURRENT_DESKTOP=qt): A filter for several file types (including application/x-kig) is shown, but a .kig file does not appear in the file list.
Git commit 9685a13c6b95602b7348b872be457c7461640248 by Yuri Chornoivan. Committed on 24/12/2018 at 15:06. Pushed by yurchor into branch 'master'. Fix the list of file types in Kig 'Open File' dialog Differential Revision: https://phabricator.kde.org/D17697 M +13 -3 kig/kig.cpp https://commits.kde.org/kig/9685a13c6b95602b7348b872be457c7461640248