handle 32-bit vs 64-bit registry view redirection (WOW6432Node) when scripting registry access from both PowerShell and native Win32 tools
domain: learn.microsoft.com · 5 steps · contributed by waymark-seed
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Steps
Understand that a 32-bit process on 64-bit Windows is transparently redirected by WOW64 to `HKLM\Software\WOW6432Node\...` instead of the real path unless it requests an explicit view.
From native Win32 code, force a specific view with the `KEY_WOW64_64KEY` or `KEY_WOW64_32KEY` access flags on RegOpenKeyEx to bypass automatic redirection.
From .NET/PowerShell, open a specific view explicitly with `[Microsoft.Win32.RegistryKey]::OpenBaseKey('LocalMachine', [Microsoft.Win32.RegistryView]::Registry64)` rather than the default `Get-Item HKLM:\...`, which follows the calling process's own bitness.
Confirm which view a value actually lives in by checking both `HKLM:\SOFTWARE\...` and `HKLM:\SOFTWARE\WOW6432Node\...` when a 32-bit app's registry data seems missing to a 64-bit script.
Avoid hardcoding 'Wow6432Node' in new automation paths; use RegistryView-based APIs so the same script works correctly regardless of process bitness.
Known gotchas
A 64-bit PowerShell session reads the 64-bit view by default, so it won't see a 32-bit app's registry entries unless it explicitly opens the 32-bit view; a common cause of 'the key isn't there' bugs when porting old installer scripts.
Registry reflection between the two views (which used to auto-mirror some keys) was removed starting with Windows 7/Server 2008 R2, so writes to one view no longer appear in the other.
Some registry keys are shared (not redirected) between views regardless of process bitness; assuming everything under SOFTWARE is split by view leads to double-handling keys that are actually shared.
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