Detecting if SQL Server Compact Edition 3.5 SP2 x64 is installed?

Question

I am building an installer and I want to bootstrap SQL Server Compact Edition 3.5 SP2. The problem is that I am looking for the registry key HKLM\SOFTWARE\Microsoft\Microsoft SQL Server Compact Edition\v3.5\ENU\DesktopRuntimeVersion. The reason that is a problem is that for 64-bit machines SQL CE requires that both the 32-bit and 64-bit installers are run. You can't install the 64-bit version until the 32-bit version is installed.

As soon as the 32-bit version is installed the registry key is populated and my bootstrapper, dotNetInstaller detects that the registry key is there and the x64 version is never installed.

Any ideas on how to tell if the x64 version is installed even if the x32 is installed?

Answer 1

x64 system with only x86 runtime installed:

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft SQL Server Compact Edition\v3.5\ENU]
"DesktopRuntimeVersion"="3.5.8080.0"
"DesktopRuntimeServicePackLevel"="2"

x64 system with both x86 and x64 installed:

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft SQL Server Compact Edition\v3.5\ENU]
"DesktopRuntimeVersion"="3.5.8080.0"
"DesktopRuntimeServicePackLevel"="2"
"DesktopRuntimeVersion_x64"="3.5.8080.0"