https://discussions.unity.com/t/what-is-what-is-unityextensions/179159
What is What is UnityExtensions ? - Questions & Answers - Unity Discussions
Dec 21, 2016 - When i updated my project from 5.4.3f1 to 5.5.0f3, some errors appeared in the console : InitializeUnityExtensions: Must have a valid path for plugin Extension...
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https://learn.microsoft.com/en-us/previous-versions/msp-n-p/ff654328(v=pandp.10)?redirectedfrom=MSDN
UnityBootstrapper Class (Microsoft.Practices.Composite.UnityExtensions) | Microsoft Learn
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