Version: 1.0-svn3 (using 4.4.00 (KDE 4.4.0) "release 222", KDE:KDE4:Factory:Desktop / openSUSE_11.2) Compiler: gcc OS: Linux (i686) release 2.6.31.12-0.1-desktop The kaffeine.desktop file contains a line X-KDE-HasTempFileOption=true which tells KDE that the applications understands the commandline option --tempfile so when kaffeine is started as the default application to play a video from an email attachment from within kmail, KDE passes also the --tempfile commandline option, which leads to kaffeine not starting and throwing an error message: kaffeine: Unknown option 'tempfile'. The simplest solution for now is to remove that line from the .desktop file See also http://bugs.kde.org/show_bug.cgi?id=94336#c13
proper --tempfile support is now implemented in kaffeine svn thanks