Gnome MIME type open actions

Hi, I'm trying to change the associations within Gnome so I can use Moz .9.5 to open HTML and the like directly from the file manager. In the control center I have changed the open action to `/mozdir/mozilla %f' but I get a message that gnome is unable to open the file with this command. Could someone explain what simple thing I have obviously missed. Thanks Rod -- 100% Linux Only genuine Linux tools were used in the generation and posting of this email.