How do you download mods for pc games?

I have a pc game called battlefield 2. i want to download this: http://battlefield2.filefront.com/file/WTF_Mod_V4_Nuke_em_Beta;86563#Download



i will give 5 points to anyone that tells me the exact instruction step by step on how to download this mod. also do i click open or save when the thing pops up?How do you download mods for pc games?
Hit download, click run, wait for it to download. once it's done, double-click it and install it into your BF2 mods folder. Once done, start/restart BF2 and go to community button %26gt; custom games %26gt; WTF mod nuke em' and press start.

Good luck, and have fun with your silenced pistol-nukes.

EDIT: You should be able to find the .exe file on your desktop.