file extension association on windows

//=== display assoication
> assoc .py
.py=Python.File

//=== set association
>assoc .pys=pysFile

//=== remove association
> assoc .pys=


//=== ftype (file type)
> ftype |findstr Python

Python.CompiledFile="...\Python27\python.exe" "%1" %*
Python.File="...\Python27\python.exe" "%1" %*
Python.NoConFile="...\Python27\pythonw.exe" "%1" %*



//=== where
> where assoc
??? could not find files for the given patterns

> where demo.bat


//=== pathExt
> echo %pathExt%


//=== http://pcsupport.about.com/od/fixtheproblem/ht/default-program-windows-7.htm

Control Panel\All Control Panel Items\Default Programs\Set Associations

Control Panel --> Default Programs --> Associate a file type or protocol with a specific program