Notepad++ Error for 64bit - ShellExecute failed (2): Is this command correct?

Cause: It happens when you set Notepad++ to "run as" administrator on Windows 7.

Fix: To fix this, you need to manually edit the registry of your system to create a new option in pop-up menu to open files with Notepad++

Step 1 : Delete existing Edit with Notepad++ entry from registry

Go into your registry as an administrator (Run -> regedit) and search for notepad++.exe. Find the key under HKEY_CLASSES_ROOT that has an entry with the Edit with Notepad++ (or maybe Edit with &Notepad++) and delete the entire key. Right click and you should see that you no longer have that option.

Step 2: Create new entry Open with Notepad++

1. Go to:

   HKEY_CLASSES_ROOT\*\shell
   

2. Create a new key under shell called OpenWithNotepad and create a subkey under that called command.
3. In the OpenWithNotepad key the default string is what you want the context menu item to be called. I set it to Open with Notepad++.
4. Still in the OpenWithNotepad key, create a new string value called icon and set the value to path-to-notepad++.exe where path-to-notepad++.exe should be the full path, e.g. C:\Program Files\Notepad++\notepad++.exe.
5. Under the command key edit the default string value and change it to "path-to-notepad++.exe" "%1" where path-to-notepad++.exe should be the full path, e.g. C:\Program Files\Notepad++\notepad++.exe.

Result: When you right click on a file, this option it should now ask you properly for giving Notepad++ admin access to a file.

You still need to go to the properties for notepad++.exe and set it to run as an administrator.