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    <p>In Windows you can change file associations from the command line using the <code>assoc</code> and <code>ftype</code> commands (see the <a href="http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/ntcmds.mspx?mfr=true" rel="nofollow">Windows Command-line Reference</a>).</p> <p>You can see what file type is currently associated with .py files using the <code>assoc</code> command:</p> <pre><code>&gt; assoc .py .py=Python.File </code></pre> <p>With that information you can then check to see what program is currently associated with the <code>Python.File</code> file type using the <code>ftype</code> command:</p> <pre><code>&gt; ftype Python.File Python.File="C:\Python2.6\python.exe" "%1" %* </code></pre> <p>You can also use <code>ftype</code> to change the associated program:</p> <pre><code>&gt; ftype Python.File="C:\Python2.7\python.exe" "%1" %* Python.File="C:\Python2.7\python.exe" "%1" %* </code></pre> <p>Associations set this way are persistent because they're stored in the Windows Registry. That means you will need to set or restore it to what you want before terminating the <code>cmd.exe</code> session. I'd suggest using one or more batch files for this purpose.</p> <p><code>cmd.exe</code> itself accepts a <code>/k</code> parameter, which you could use to have it execute a batch file at start up that sets up the file association you want initially. You could then also provide a custom <code>quit.bat</code> that would restore it before exiting the <code>cmd</code> session.</p>
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    1. POTemporary file association for single cmd.exe session
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    1. COI need the scope of file association to be limited to cmd.exe session, i.e. parallel cmd sessions (with different python virtualenv) should not be affected.
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      1. USanatoly techtonik
    2. CO@techtonik: On Windows associations are a function of the global OS Registry, so it seems that you'll need to explicitly specify which version of the Python interpreter you want used to execute the script. It's unclear why you want to avoid doing that so badly as it doesn't seem any worse than setting-up an association for/in a `cmd.exe` session would be.
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    3. COThe problem is that when users execute 'django-admin.py' for example, it is executed with default python, not the one installed in virtualenv, and the script fails. While it is possible to rewrite all instructions and add 'python' prefix, I'd like to avoid this if possible.
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