In Xfce 4.10 I set 'opera' in my preferred apps, but when I choose Help > Help in Orage, the Firefox will be called. I think this is a bug and that exo-open should be used instead.
Fixed in 4.9.7.3
That's strange: I tested 4.9.8.0, and now Help always gets displayed in Midori. :) I checked and I have Opera in the Preferred Apps. Do you see this? PS I now set up an Ubuntu PPA for daily builds of latest Orage GIT code: https://code.launchpad.net/~landronimirc/+archive/xfce-daily . It should be useful for testing.
Works for me. I just changed exo-preferred-applications to be midori and help started to be shown in midori. Before that it started chromium. Does it work from command line? I just start command: exo-open "file://usr/local/xfce_4.10.0/share/orage/doc/C/orage.html" or exo-open /usr/local/xfce_4.10.0/share/orage/doc/C/orage.html your orage.html may be in different place of cource. exo-open -V exo-open 0.3.101
$ exo-open -V exo-open 0.10.2 It must be some issue with local exo-open then. $ exo-open /usr/share/orage/doc/C/orage.html fires up Midori (as Orage does), even though Opera is selected in Prefs. So false alarm.
Fixed in 4.10.0