Why don't 8.04 panel launchers work on 10.04

Question

I copied my panel launchers verbatim from 8.04 to 10.04, residing in both systems in the same path:

$HOME/.gnome2/panel2.d/default/launchers

However, for some reason, they are not visible on 10.04's GNOME panel.

Why?

Update 1: In my attempts to troubleshoot the problem I:

1. Verified that copied 8.04 launchers have same permissions as manually created 10.04 launchers (-rwxr-xr-x).
2. Added the first line as: #!/usr/bin/env xdg-open
3. Logged off, then logged on.
4. Rebooted.

Update 2: I manually created a new launcher which would duplicate the functionality of a copied one. This one of course shows up and so I went ahead and compared the two, step-by-step bringing them to being identical! (copied icon paths, then removed the 'Encoding=UTF-8' line, etc.).

None of the above helped. So the question remains: Why?

Is there some type of "registry" out there?

Answer 1

The launchers are registered in subfolders of /apps/panel/objects in the GConf settings database:

To backup all your panel launchers, you will need to copy both the launchers and their registrations:

1. launchers: $HOME/.gnome2/panel2.d/default/launchers/
2. registrations: $HOME/.gconf/apps/panel/objects/