Unable to add older rubies (187...)

I have a 2.4. and a 1.87 version. I was able to add 2.4 without issues but 1.87 was giving me a Unable to register e:\ruby\ruby187\bin\ruby.exe due to missing ruby info

This went for a while but I found a workaround, so to help others, here my solution:

My issue was that ruby v187 was unable to comply with the environment variable 'rubyopt' that was set to '-Eutf-8' (by the other version I presume), this prevented the admin add command from getting the version of this older ruby and thus failed the registration process.

Running 'set rubyopt=' to unset it allowed me to run uru admin add 187 successfully.

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