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Failed to load libGL

I am running a newly installed Debian stretch stable 64Bit.
When i try to execute a game via wine or playonlinux i get an error like this:

0009:err:wgl:init_opengl Failed to load libGL: libGL.so.1: cannot open Shared-Object-File: File not found

Apparently i miss opengl.
I did some research on the web and on my system but couldn't find a solution yet.

More info:
exists and points to

I am running the prop. nvidia driver 390.87 installed stretch-backports.

Maybe someone can help me..