Visual Studio 2015 prof Windows 10 prof and CR 13.0.15

Hi,

i have a Problem.

I have a newly installed Windows 10 prof german computer and installed a Visual Studio 2015 prof german.

After that in found and installed CRforVS_13_0_15.exe.

So far so gut.

But when i converted a Projekt to Vs 2015 i couldn't open any rpt file, the  only view i had was the hexeditor.

I searched the internet, and checked that Framework 3.5 was installed. I deinstalled everything and reinstalled it.

But nothing changes. i can add and use a Reportviewer in any Projekt.

But a canoot open a Report file or add a new one

thank you