Sometimes you want to be able to drag and drop one or more SAZ files into Fiddler. Currently, it seems the logic is that you can open or import each SAZ into its own tab.
The use case here is if you want to merge multiple SAZ files into one without having multiple tabs created. Instead they could be added to whatever current tab is selected. If it is Live Traffic, the SAZ files would get imported in there. If it's a saved session, it would be imported in that session.
Markign this one as a feature request to be triaged by the Fiddler developers team