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Do realize that I am giving an opinion, so what I tell you is not based on fact, but observation. I do believe that the primary differences between the XP registry and Win7 registry is probably subtle and in the way it is stored. Kind of like the differences between different versions of a DB program. The Win7 registry is probably more efficient and may having settings stored in a slightly different location (for the newer settings), otherwise it is backwards compatible because any and all settings can be exported to a common text based format. If you have ever noticed, the export of a setting into a reg file gives version 4 for XP and ver 5 for Win7. The conclusion is that you will not directly see differences in the registries if only because they are *only* accessed on the OS they were made for. The export format is the same, so how the registries are used does not matter to the programs. As long as the correct data is returned, it should not matter the differences.