Environment.SetEnvironmentVariable() messing up system variables and registry keys

[ggzengel]

I had a look in your code and I guess you have the same problem like here: https://github.com/dotnet/runtime/issues/1442

I'm searching for a small tool which don't mess up with this.

[anf]

Hi @ggzengel, I opened an issue if you're interested; #5.