This upstream commit is basically wrong
2005-10-07 Christopher Aillon <email@example.com>
* nm-vpnc.desktop.in: use a category for the desktop entry.
(Patch from: Rodrigo Moya <firstname.lastname@example.org>)
We _only_ want the desktop file to setup the association between .pcf files and
the properties dialog for e.g. launching the import program from double clicking
/ opening an attachment. Specifically we really don't want to show "VPN
Connection Manager (vpnc)" in the menus.
Please fix this upstream too.
Fixed upstream: http://bugzilla.gnome.org/show_bug.cgi?id=333854
Looks like this was fixed a while ago.