<p>Double-click on the extension you would like to rename and the following window appears:</p>

<img class="screenshot" src="http://www.tri-line.com/common/img/documentation/tim_professional/renaming_extension.png" alt="Renaming an extension" />

<p>Overtype the new name for the extension and then press the OK button. You can edit any
other extension property in the same way, simply overtype before
pressing save.</p>