Notepad++ is a very nice free text editor, which also supports different computer languages.

If you would like to be able to view Experimentor codes with Notepad++, you can download the following (zipped) Notepad++ language definition file.  Unzip the downloaded file and you’ll find a file called:

Experimentor-Codes-Syntax-Colouring-For-Notepad++.xml

Then, inside Notepad++ go to the View menu and choose “User defined dialogue…”.  Click the Import button and select the “Experimentor-Codes-Syntax-Colouring-For-Notepad++.xml” file.  Click Okay and now when you load *.codes files they will be syntax highlighted.