Install Syntax Highlighting

To enable the colour coding (syntax highlighting) in Notepad++:

Download the Notepad++ Syntax Highlighting File from the TUFLOW website.
Save the file to a location on your computer.
Import the syntax highlighting by selecting Language > User Defined Language > Define your language...
In the dialogue box, select Import:
Navigate to the Notepad++ syntax highlighting xml file and select it. Click 'Open'.
Close any open TUFLOW control files (.tcf, .tgc, .tbc, .ecf).
Restart Notepad++.
Open any TUFLOW control file (.tcf, .tgc, .tbc, .ecf). The syntax colouring should now be associated with TUFLOW files.

Update Syntax Highlighting

When updating the syntax highlighting file with a newer version, first remove the existing "TUFLOW" language definition:

Remove the "TUFLOW" language definition by selecting Language > User Defined Language > Define your language...
Select "TUFLOW" as the User Language and select "Remove".
Restart Notepad++ before loading the new syntax highlighting file.
Follow the above listed steps to install the new syntax highlighting file.