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    <p>According to <a href="http://www.samlogic.net/articles/32-64-bit-windows-folder-x86-syswow64.htm" rel="nofollow">this note</a>, the Program Files (x86) folder is specifically intended for 32-bit program files, as opposed to the Program Files folder, which is intended for 64-bit programs.</p> <p>But in order for a 32-bit program to pretend that it's on a 32-bit machine, the name of the working directory has to be returned as 'Program Files,' because that's what it would be on a 32-bit machine. This is what you're seeing when you ask Windows for the working directory with getcwd(). Since your program is trying to use that directory name in a path, and that's not actually the path to the file on the real, 64-bit machine, it breaks.</p> <p>Looking at the <a href="http://msdn.microsoft.com/en-us/library/aa384274.aspx" rel="nofollow">WOW64 docs</a>, I suspect the reason it only breaks when launched from the start menu is, that's an instance of a 64-bit process creating a 32-bit process, which causes the system to change the ProgramFiles environment variable. In the case where you double-click to launch it, it's a 32-bit process from the beginning.</p> <p>It seems you're not the only one to encounter this; <a href="http://msdn.microsoft.com/en-us/library/aa365744%28v=vs.85%29.aspx" rel="nofollow">this Windows API</a> seems designed specifically to work around the problem you're describing. If nothing else it suggests the behavior you're seeing is by design.</p> <p>But this is academic. To insulate yourself from this sort of thing, I would get the absolute path to your exe, using something like <code>os.path.realpath(__file__)</code>, and go from there.</p>
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    1. POUnusual Python exe behavior when running from Progam Files X86 versus Program FIles on Win7 is there some virtualization going on?
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    1. COWell why does it work for the versions installed in the Program Files directory? Notice, I am talking about the exact same app installed in numerous places and in every case I installed a short cut on the start menu. If you can clarify this I would appreciate it.
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    2. COIt would work installed elsewhere if the links to the other installation have inside them a "start in" folder that allows them to find the folder.
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    3. COSo- (grr enter handling) the typical way to handle this is to get the path that launched the executable from sys.argv[0], pass that through os.path.abspath(), and be on your way.
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