Preferred Applications > Mail Reader setting for Thunderbird is incorrect

[Gerry Tool]

The System > Preferences > More Preferences > Preferred Applications > 
Mail Reader setting for the Thunderbird Mail choice sets the command to 
"thunderbird mailto:%s" where it should be "thunderbird %s", the same as 
the other choices for evolution and kmail.  To get a mailto: link in a 
web page to set the address in thunderbird correctly, one has to use the 
Custom setting and remove the mailto: part of the command.

This is true in both FC5 and FC6T2.  What component should I file a bug 
against?

Thanks.

Gerry