File type detection prevents opening Planner files

Binary package hint: nautilus

I attempted to open a Planner file by double-clicking it in Nautilus. Rather than opening Planner, it displayed the following in an error dialog:

> The filename "New Login and Logout.planner" indicates that this file is of type "Planner project plan". The contents of the file indicate that the file is of type "XML document". If you open this file, the file might present a security risk to your system.
> Do not open the file unless you created the file yourself, or received the file from a trusted source. To open the file, rename the file to the correct extension for "XML document", then open the file normally. Alternatively, use the Open With menu to choose a specific application for the file.

If planner is installed, it should simply open it. If planner is not installed, it should trigger the package suggestion mechanism via gnome-app-install.

ProblemType: Bug
Architecture: i386
Date: Tue Mar 20 11:05:41 2007
DistroRelease: Ubuntu 7.04
ExecutablePath: /usr/bin/nautilus
Package: nautilus 2.18.0.1-0ubuntu1
PackageArchitecture: i386
ProcCmdline: nautilus --no-default-window --sm-client-id default2
ProcCwd: /home/mdz
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
SourcePackage: nautilus
Uname: Linux mizar 2.6.20-11-generic #2 SMP Thu Mar 15 08:03:07 UTC 2007 i686 GNU/Linux