I'm not familiar with nmake (other than what I just looked at in the docs) but this seems like a good approach to try first. Hopefully the nmake file ends up being easy to generate from the current Makefile.

You could also try writing a make.bat script. Sphinx provides a default script when a repository is initialized. I think this would be more of just a "run everything everytime" and lose some of the dependency checking behavior of Make, but it's a potential solution.

In the end, the final versions of the docs will be built on Github Actions using Ubuntu-latest, so the ability to build the docs on Windows is really only important in so far as it helps you in the development cycle. If you can manage the development cycle by building + viewing the notebook version of the *.py file using jupytext directly, that's probably good enough.

I just wanted to note that when I was messing around with this earlier I discovered that it isn't an issue with making the actual .ipynb files. I was able to do this manually (i.e. jupytext --to ipynb --execute tutorials*.py), from the ./docs/ directory. Once doing this, the make file had no issue with compiling the docs for all the tutorials. I will look into what may be causing the makefile to not run this command when executing.