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This functionality is used to control the creation and opening of named device objects in a case-(in)sensitive way. It is controlled with a REG_DWORD value named `IoCaseInsensitive` inside the registry key `HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\I/O System` . When compiled for Win7+, case insensitivity is enabled, which is the expected default (like in the Object Manager). When compiled for Vista and below, case insensitivity is disabled by default. The registry setting allows changing this behaviour for backward/forward compatibility. See the comparison tables at: https://redplait.blogspot.com/2011/07/cmcontrolvector.html https://redplait.blogspot.com/2012/06/cmcontrolvector-for-w8.html https://redplait.blogspot.com/2016/03/cmcontrolvector-from-windows-10-build.html