I'm always reluctant to update registry files, but it's starting to look like that's the only option.  Old system will not boot from the old system drive.  I can put the old drive in a USB dock, and try that approach.  


Which NTUSER.DAT would you look in?  C:\users\<My Login User>, C:\users\<All Users>...?
HKEY_CURRENT_USER\Software\Cakewalk Music is stored in NTUSER.DAT, right? 
A lot of the registry is in C:\Windows\system32\config... 

Many Windows registry hooks in Sonar, thinking that may have made cross-platform (MacOS) more difficult.
 

Just guessing I do not use Cakewalk Presets other than the ones installed with the DX plug-ins. That said, it appears the presets are stored by user so I would expect to see them in the login users files. Would it be in HKEY_CURRENT_USER? I would have guessed HKEY_USERS because that is the real user data. I make no claim to being a Windows authority.

Thanks, fortunately I was able to startup SPLAT on the old system and export the presets.