This software was created using C++ with the Microsoft VC++ 2010 runtime, OpenGL 3 and Microsoft .Net 4.
You may need to install the respective runtimes and a graphics driver.
You also need to know whether you have an NVIDIA or an ATI graphics system.
I have tested this with Minecraft 1.4.6 + Buildcraft 3.X + Redpower 2.X + Industrialcraft 2.X, and with vanilla Minecraft 1.6.2.
It worked well :)
First of all, let's create a new Minecraft world.
For this one, I have used the seed "Mischievous".
We go to some grass and note down the X and Z coordinates (F3).
On the screen with the saves, check out the name of the save on the disk.
Now, unzip the editor into its own, new folder.
Run "First start and tasty fresh cookies!.bat".
If your system is set up correctly, the output of this process should look like this.
The editor's plugins were just compiled.
Two new batch files appeared.
You must run the NVIDIA or ATI batch file if you have the respective graphics system.
I have an NVIDIA system, so I ran the NVIDIA file.
A marker file appeared, giving a hint to the graphics engine what to do differently.
Bring up Notepad or any other text editor and open the "target world.cfg" file.
Click on the "All Files (*.*)" filter in Notepad to see that file.
Paste the full path of your Minecraft save into that file.
MAKE SURE that the file ends there.
You must not press return at the end of that line to start the next line.
Make sure that you are not in your Minecraft world anymore - only either Minecraft or the editor can run and operate at the same time, otherwise there will be crashes.
Click on "Make a desert" and type the coordinates as memorized.
We also define a square area of 30 x 30 blocks of floor space to run the modification.
Click on "Start".
Depending on the size of the area you've selected, this can be really quick, or take really long.
While doing its work, the editor will appear frozen, so please start very small at first to get a feeling for it.
Note that there is no notification currently for when the process finished, so when the area is relatively small, it will appear as if nothing happened at all.
Now close the editor and load your world again in Minecraft.
It should now be a little different.