Answer: The is a Windows component that stores system and settings. Generally, you should not manually edit the registry, since registry errors can cause a variety of problems. However, in some cases, small modifications to the registry can fix existing issues. Therefore, Microsoft includes a program called 'Registry Editor,' which can be used to view and modify the Windows registry. You can open the Windows registry by typing regedit in the search tab of the Start Menu in Windows XP and Windows 7. You can also open it by typing regedit.exe at the DOS.
The actual program is named regedt32.exe and is located in the following location: C: Windows System32 regedt32.exe. If you navigate to the System32 directory, you can double click the regedt32.exe icon to open the Registry Editor. Be careful not to modify any files in the System32 folder, since they are part of the Windows operating system. When you open Registry Editor, the following window will be displayed: Each of the folders in the left sidebar contain different types of registry settings, called 'registry keys.'
Regedit From Command Line
Open Regedit From Command Prompts
Add “Open Command Window Here” to Context Menus by Editing the Registry Manually. To put the Command Prompt command back on your context menus, you just need to make a single edit in the Windows Registry.