直接来自： https://superuser.com/questions/343519/python-idle-disappeared-from-the-right-click-context-menu

这是一个reg文件，用于添加命令以使用IDLE编辑Python.File（.py）和Python.NoConFile（.pyw）文件类型。适用于安装在C：\Python27中的Python 2.7，因此请替换与您的安装相关的pythonw.exe和idle.pyw路径。将其保存到.reg文件。然后右键单击并选择合并。

Here's a reg file to add the command to edit with IDLE for Python.File (.py) and Python.NoConFile (.pyw) file types. It's for Python 2.7, installed in C:\Python27, so substitute the paths to pythonw.exe and idle.pyw that are relevant to your installation. Save it to a .reg file. Then right-click and choose Merge.

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Python.File\shell\Edit with IDLE\command]
@="\"C:\\Python27\\pythonw.exe\" \"C:\\Python27\\Lib\\idlelib\\idle.pyw\" -e \"%1\""

[HKEY_CLASSES_ROOT\Python.NoConFile\shell\Edit with IDLE\command]
@="\"C:\\Python27\\pythonw.exe\" \"C:\\Python27\\Lib\\idlelib\\idle.pyw\" -e \"%1\""