How to completely dissociate .hex files from Notepad?

 Use Command Prompt or PowerShell

    Open Command Prompt or PowerShell:
        Press Win + S, type cmd or powershell, and press Enter.
    Remove the Association: Run the following command to delete the .hex file association:

assoc .hex=

2. Edit the Registry

⚠️ Be cautious when editing the registry. Back up your registry before proceeding.

    Open the Registry Editor:
        Press Win + R, type regedit, and press Enter.

    Navigate to the File Type:
        Go to: HKEY_CLASSES_ROOT\.hex

    Delete or Edit the Key:
        If the key points to Notepad, delete the Default value or modify it to an empty string.

    Clean the Associated Program Entry:
        Navigate to: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.hex
        Delete the subkeys like OpenWithList or UserChoice to remove any lingering associations.

    Restart Your Computer to apply changes.

Bye Gastone