ReadRegStr on 64 bit WinXP

[ddod]

I have an installer that I need to run on both the 32 bit and 64 versions of windows. Everything seems to work great except that the ReadRegStr doesn't seem to return anything under the 64 bit version.

Here is the code

code:


ReadRegStr $0 HKLM "SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\4F1E2E1CD3D64DA40A02AE386949B0F8\InstallProperties" "DisplayName"

I know this registry entry exist and is a string. It returns a value fine under the 32 bit version but not under the 64 bit version.

What am I missing or is this command just not compatible with the 64bit version? If compatability is and issue is there another option for checking a registry entry?