[Users] Claws fails to autostart under LXDE.

[52midnight]

FWIW, Iceweasel (Firefox) also has trouble with the %u parameter, which
I assume should either be replaced or deleted by the Window Manager.

However, it responds by trying to open it as a URL, and leaves you with
a page containing a polite apology for being unable to do so. Deleting
it removes the offending page, but Icedove (Thunderbox) then refuses to
open links in Iceweasel.

Seems like a better solution IMHO.

Carl