Cannot disable "Display PDF in Browser" in Adobe Reader 2015

Hi there,

we use Adobe Reader 2015.006.30119 Classic Track and IE11 on about 300 Workstations. To get a special application working I have to disable the feature "Display PDF in Browser" by GPO.

I have deactivated the Adobe Reader Add-On in IE by using the ClassID and everything was ok using Reader XI. But not in 2015. The setting shows no effect. Although the Add-On is deactivated,

the PDF's are still shown in a new tab in IE11.

I also tried the regkey  [HKEY_CURRENT_USER\Software\Adobe\Acrobat Reader\2015\Originals]

"bBrowserIntegration"=dword:00000000   but with no success.

Can anybody help me to get this working?

Thx in advance.

Bodo