[Wine] exo package from xfce affects shell open URLs?

[leniviy]

Hi. Recently, in addition to Gnome I installed xfce.
Now, if firefox already started, and I open URLs in wine, I get this message box:
******************
Failed to execute default Web Browser.
No child processes.
******************
With trial and error I found that the package exo is causing this.
http://www.xfce.org/projects/exo

Please someone try to reproduce: install exo and run: 
$ wine start http://www.winehq.org/

Window manager Gnome, default browser firefox. Wine 1.3.14-1.3.16
exo 0.6.0-2