How to access the 64-bit registry from a 32-bit Powershell instance?

Question

If you launch a 32-bit instance of Powershell (%SystemRoot%\\syswow64\\WindowsPowerShell\\v1.0\\powershell.exe), then the registry provider only sees the limited 32-bit part

Answer 1

The REG.EXE command can write to 64-bit registries so the below should be safe for 32/64-bit from powershell.

®.EXE @('ADD','HKLM\YOURPATH\...','/v','KEY','/t','REG_DWORD','/d','12c','/f','/reg:64')

Seems quite a bit simpler and less error prone than the other solutions. This may have came out years after mind you.