Smart Notebook 23 - default to opening 22?

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Hi,

 

Is there anyway to make Smart Notebook 23 open the 22 version by default when you double click on a .notebook file? I know you can "View"->"Open in Notebook 22" afterwards, but I'd like it to default to 22 as it has more features and will help our Maths teachers.

 

Thanks.

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For reference:

 

When I use notebook.exe it opens 22 (or rather 23 in 22 mode), when I use launchnotebook.exe it opens 23 - and that's fine for the shortcut in our menus, to force 22. However, when it comes to opening .notebook files, even though the ftype (by default) runs notebook.exe, it opens in 23 mode. I've had a quick look through the strings using process manager, and I can't see any obvious command line options to choose between the two. I'm assuming when it has a parameter (the filename in the case of double clicking on a .notebook file) it must just default to 23?