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Greetings. While using IPython.external.mathjax to install a
downloaded ZIP file on Windows, I encountered the exception
"zipfile.BadZipfile: File is not a zip file". The first of the
attached patches resolves that by opening the file in binary mode.
(I'm submitting patches instead of a pull request because I'm not on
GitHub yet.)<br>
<br>
While I was in the neighborhood, I made some other changes, offered
in the remainder of the patches. The most significant changes are
edits to the installation instructions for MathJax and to various
strings in the mathjax module.<br>
<br>
I hope that you find these helpful.<br>
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