As I mentioned in PM, the steam version does not use or make registry files. This is not part of saving; this is stuff created by the installer, to tell the game where it's installed, whether it's a standard or maximum install, what disc drive it was installed from, where the FMV movie files are, etc. Only used by the 1998 version.
The Steam version doesn't have standard/maximum install, doesn't require a disc, and just puts the movies in always the same directory relative to itself, so it doesn't use registry file.