Update windows.md

feicc · Dec 6, 2016 · 7d4a5e9 · 7d4a5e9
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 * Node.js 4.4.x or later (the architecture of node available to the build system will determine whether you build 32-bit or 64-bit Atom)
 * Python v2.7.x
   * The python.exe must be available at `%SystemDrive%\Python27\python.exe`. If it is installed elsewhere create a symbolic link to the directory containing the python.exe using: `mklink /d %SystemDrive%\Python27 D:\elsewhere\Python27`
+* 7zip (7z.exe available from the command line) - for unpacking Chromedriver and creating distribution zips
 * Visual Studio, either:
   * [Visual C++ Build Tools 2015](http://landinghub.visualstudio.com/visual-cpp-build-tools)
   * [Visual Studio 2013 Update 5](https://www.visualstudio.com/en-us/downloads/download-visual-studio-vs) (Express Edition or better)