This tutorial will cover how to package your mod from a 'data' folder into a Dat file. One of the main advantages of putting your mod into a dat file is that you don't have to worry about setting the *.pro files as read only and it is also a whole lot tidier.
In the 'Source Files Directory' browse to your mod's data folder. Then in the 'Destination Dat Filename and Patch' enter the location and dat filename that you want. Now just click the 'Build Dat File' button, wait a few moments for the dat file to build and your finished. You now have your mod compressed into an easy to distribute dat file.