How to Install Zoo Tycoon 2 Mods in Windows 7

[Tiranel]

Once you have your mod(s) downloaded and unzipped, find the .z2f file. Right click and choose "Copy".

Navigate on your computer to C:\Program Files (x86)\Microsoft Games\Zoo Tycoon 2

Paste only the .z2f file here and not into a sub-folder. (You will need Administrator privileges to paste into the directory.)
Run the game and use freeform mode to check the mod(s) installed correctly. (Always make sure your mod is compatible with your expansions else it won't work no matter what you do!)

Quick side-note, the easiest way to find your Application Data in Windows 7 is to open your Start menu and type %appdata% into the "Search for programs and files" bar. Press enter and voila.