I recently installed Notepad++ on 2 PCs, and noticed that on one of them the “Edit with Notepad++” context menu entry was missing in Explorer.
After some digging I found that Notepad++ and SciTE register the same CLSID under
Steps to register Notepad++ in the context menu:
- Uninstall SciTE
- Re-install Notepad++
- Kill and restart explorer.exe from Task Manager (or reboot)