Open Prime 3 worksheet in new tab instead of new session?

[akelly]

I installed Mathcad Prime 3. I noticed that if you have Prime 3 open and double-click on a worksheet in Windows Explorer, it launches the worksheet in a new session of Prime 3. I'd rather have the worksheet open in a new tab in the original Prime 3 session. Is there any way to change this behavior?

[ValeryOchkov]

I know this behavior too and...

I open sheets not thru double-click but thru open files from Mathcad (15, Prime 1-2-3).