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January 16, 2008

Windows Filesystem Case Sensitivity — Windows *can* be case sensitive

I never knew this until today, but the Windows filesystem *can* be case-sensitive.

The HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\kernel\ dword:ObCaseInsensitive registry key controls filesystem case sensitivity. If set to 0, the filesystem is case sensitive, if set to 1, it is case insensitive.

Note: After you install a Microsoft .NET Framework 2.0 update, a file system’s case sensitivity changes from case sensitive to case insensitive. (See Microsoft KB Article 929110)


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