Thanks for openpyxl ...
I just noticed that, in your current docs, you advise developers to download and use Christoph Gohlke's wheels for lxml:
Testing just now, it looks as if openpyxl does not need lxml - at least, it does not come down with "pip install lxml". But - lxml has had Windows wheels for a while - now back through version 4.0.0.
Maybe worth amending the install instructions to reflect this?