OpenRegedit

The Registry Editor is an advanced tool that comes with Windows, which can be easily accessed via the Start Menu. However, Windows only allows you to open a single instance of the Registry Editor, which is quite annoying, especially if you want to compare the content of two registry entries.
Any new attempt to launch a second instance only moves the focus to the first window of the Registry Editor. OpenRegedit comes to the rescue to solve this issue, providing a console application that can launch a 32-bit or 64-bit version of RegEdit on a 64-bit Windows computer.
OpenRegedit can be launched either as a 32-bit (x86) process or as a 64-bit (x64) process on a 64-bit machine. To choose the architecture type, just type in either “-x86” or “x64” as an argument. There is an “INFO.txt” file describing the syntax inside the archive if you need help.
As a console application, OpenRegedit can be integrated into various development projects related to system management tools.
Viewing two registry entries side by side would really come in handy when comparing the keys. OpenRegedit makes that possible by allowing you to easily launch two separate instances of the Registry Editor.