the x_100_100.z2f file i found in my zoo tycoon 2 folder - but it may be in the ES folder depending where you installed your game - all you need to do is unzip it and you have lots of folders like the entities, ai, lang, biomes etc in that file (the original zt2 had each of those files in a seperate z2f file this has them all in the file) be aware they are not zipped into a seperate folder called x100_100 like the entites.zsf etc were - hope that makes sense?