[Minecraft 1.7.3] Tree, Nether, Pyramid and Floating Dungeons Mod v4

Tree Dungeons
This is a world generation modifying Minecraft mod that adds 4 new type of dungeon: Tree dungeons, Nether, Pyramid and Floating dungeons!

Tree dungeons:


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Simply, the tree dungeon is a dungeon that generates on the surface as a bunch of trees. Currently there isn’t much unique about this but I hope to add more things over time.
Nether Dungeons

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Simply, it is a dungeon that generates in the nether with a pillar in the middle and lava at the bottom.
Pyramids


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(yes yes a snow biome, they never showed up when I limited their spawning to sand.)
Simply, pyramids are pyramid shaped dungeons with a fountain in the middle and 4 random monster spawners. There is a chest hidden in the pyramid as well, try and find it.
Floating Islands

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Floating islands! They look like they have been torn straight from the ground. Inside the floating islands is a mob spawner and a chest. Be careful though! Mobs can spawn in the crater too!
The rarity is as rare as I can reasonably manage to get them. They have a 1 in 3 chance of checking a chunk, and a 1 in 100 (1 in 50 for nether dungeons and 1 in 75 for pyramids but still very rare) chance of spawning there if the chunk is suitable. And a suitable chunk is rare.
Videos:

Installation:
(Make sure to install Modloader before this)
1) Open up %appdata%, if you don’t know how to do this, start>run, then type in %appdata%
2) Browse to .minecraft/bin
3) Open up minecraft.jar with WinRAR or 7zip.
4) Drag and drop (AKA copy) the files in the zip into the jar.
5) Delete the META-INF folder in the jar.
6) Run Minecraft and enjoy!
(Thanks Risugami)

Download Link:
 http://www.mediafire.com/?k2ragu0iblkkask