The Dolphin 7 platform consists of about 5,000 files. I would imagine there are somewhere around 100,000 lines of code.
Sometimes, you may need to find in which file, a particular string of text occurs, or where a specific image is called. You can easily do this by keeping an unzipped copy of all the Dolphin source files on your computer, and use a good file search utility to find what you are looking for.
I use a program called Agent Ransack. It's free, and you can download it here:
http://www.mythicsoft.com/page.aspx?page=download&type=agentransack
