The notebook server, not the kernel, is responsible for saving and loading notebooks, so you can edit notebooks even if you don’t have the kernel for that language—you just won’t be able to run code.
cd %USERPROFILE\notebooks
jupyter notebook
[I 11:42:17.268 NotebookApp] Serving notebooks from local directory: C:\Users\userName\notebooks
...
http://localhost:8888/?token=e04238d8a3e89b2c8d21fe20f9927949da953d1405fa55c9