I appreciate the benefits of Ultra Edit Studio but now I'm also working on my projects within Visual Studio 2013. For now, until the editor project is finished, the VS editor is harder to work with. So here is a tip that makes the task much easier. I'm using this strictly for the .prg files since the VS does handle C files properly.
In Visual Studio, under Files, select Open and then a file. Find a .prg file in your project. Use the down arrow on the right of the Open button, and select Open With. Use the browser to find the Ultra Edit .exe file and select it. ( You could actually do this with your editor or choice ). Hit the Add button. You will be asked if you want this to be the default for .prg files and you answer Yes.
Now, while working in Visual Studio on a project, any time you click on a .prg source file, it will open the file in Ultra Edit ( in a separate window ). Do your magic, and when you save the file in UE, the changes will be made in your project. If you then do a Build in Visual Studio, it will incorporate the changed code successfully.
I found this to be useful, and I hope it helps some others. You could try the same method with other editors, and report back how it works for you.
Tim