KPro Test with ...serverInfo fails

Hi all,

I installed a new KPro 6.50 on Windows 2012 R2 server with IIS 8.5.

The Installation didn't show any error but when I test with http://localhost:1090/ContentServer/ContentServer.dll?serverInfo  I get a message to download or open a file. When I download the server downloads the ContentServer.dll

I don't have any idea what can be worng.

Regards

Reinhold