I am running Windows 8 Enterprise x64. I logged on using an account from the Administrators group. When I open Windows Explorer or a command prompt, then I can see the file
C:\Windows\system32>dir cdd.dll Volume in drive C has no label. Volume Serial Number is ▨▨▨▨-▨▨▨▨ Directory of C:\Windows\system32 07/25/2012 09:49 PM 199,680 cdd.dll
But if I open an Open File dialog from Chrome browser, Visual Studio or some other applications (they are all 32-bit apps) and navigate to
C:\Windows\system32 then there is no such file (the filter is set to show All Files). And if I invoke the "Open command window here" context menu item using Shift+RightClick in the Open File dialog and type
dir it confirms that there is no such file:
C:\Windows\System32>dir cdd.dll Volume in drive C has no label. Volume Serial Number is ▨▨▨▨-▨▨▨▨ Directory of C:\Windows\System32 File Not Found
This effect is not specific to
cdd.dll, many other files differ as well. I've been told that this is an effect of the file system virtualization, that I know very little about.
Could you please explain or give me a reference that explains how this actually works? Are there actually several different instances of the
System32 folder. What is their physical location on the disk? Is it possible to access from a 32-bit process files in a different
System32 folder than one shown to 32-bit processes by default.