How do I uninstall "Microsoft .NET Core 1.0.0 RC2 - VS 2015 Tooling Preview 1"?

Download a copy of the installer exe from Microsoft:

• DotNetCore.1.0.0.RC2-VS2015Tools.Preview1.exe
• DotNetCore.1.0.0-VS2015Tools.Preview2.exe
• DotNetCore.1.0.0-VS2015Tools.Preview2.0.1.exe
• DotNetCore.1.0.1-VS2015Tools.Preview2.0.2.exe
• DotNetCore.1.0.1-VS2015Tools.Preview2.0.3.exe
• DotNetCore.1.0.1-VS2015Tools.Preview2.0.4.exe

After choose this file when asked. Then you can successfully remove it.

In my case, I also had to manually start the .exe as Administrator, otherwise uninstall completes, but does not actually remove .NET Core installation.