<iframe src="https://exploratory.io/data/hideaki/List-of-Locales-That-are-Valid-on-R-on-Windows-1008444209444495?embed=true" frameborder="0" width="100%" height="100%" > </iframe>
This is how we get the list of locales that are valid on R on Windows, which we use for command completion etc. on Exploratory.