Some of files open-sourced as part of CoreCLR still have a .cool file extension: https://github.com/dotnet/coreclr/blob/release/1.0.0/tests/src/baseservices/re

Some of files open-sourced as part of CoreCLR still have a .cool file extension: https://github.com/dotnet/coreclr/blob/release/1.0.0/tests/src/baseservices/regression/v1/assembly/vos/cool/helloworld/first.cool https://github.com/dotnet/coreclr/blob/release/1.0.0/tests/s...