

It's an Outlook Express error as you can see, but I use Mozilla Thunderbird as default email client, so why doesn't XnView start Thunderbird?
Doesn't a standard API exist to create a new email with specified attachments? (I'm thinking of MS Office, Openoffice, etc "SendTo" commands)
PS: I can't remember if I've blocked Outlook Express's execution with the HIPS software I'm using, however this is not the point.
I'm not interested in getting OE to work with XnView (though I understand it's a problem for XnView users who have OE as email client), but rather in understanding why XnView doesn't use the system default email client