Right-click on the extension and go to New > Key. Then, scroll down and look for the file extension that corresponds to the app you want to add to the New Item menu in File Explorer-in our case. In the Registry Editor, expand the HKEY_CLASSES_ROOT key in the left sidebar. Click regedit under Best Match, or press Enter, to open the Registry Editor and give it permission to make changes to your PC. Open the Registry Editor by hitting Search/Cortana and typing regedit. RELATED: Learning to Use the Registry Editor Like a Pro And definitely back up the Registry (and your computer!) before making changes. That said, if you’ve never worked with it before, consider reading about how to use the Registry Editor before you get started. This is a pretty simple hack and as long as you stick to the instructions, you shouldn’t have any problems. Standard warning: Registry Editor is a powerful tool and misusing it can render your system unstable or even inoperable. Now that our new file is in place, we’re going to add a key to the registry that will use that file to create new files in the program we’re adding to the New Item menu. Step Two: Add Your Template File to the Registry
You may see other files there that were added automatically when you installed other programs.
The file is pasted into the ShellNew folder.
