double-click a pkg starts wrong version of Modeling

For my job I have installed several versions of Modeling on my notebook. When I double-click on a .pkg or .bdl-file, it opens Modeling version 17.0,but I would rather like Modeling to open in version 19.0. I have tried several things like changing the default program in Windows, made changes in the regestry, but Modeling keeps starting in version 17.0. I think it is because version 17 was the latest version I have installed.

Reinstalling version 19.0 did solve the issue, but i think that's a rather drastic, time consuming operation. it would be much easier if:

• an environment variable could be set containing the version that should start. (like for drafting MEPELOOK=2)
• you could choose in the list 'open with' with what version you want Modeling to start.