putting mods problems

[LukyBastard2]

i really need some help.

when i try to put a mod it doesn't work for me i download the mod i clicked with left click and it doesn't do anything and when i double click with my left mouse on a mod it says windows needs to know what program you want to open this.

i would really like for some help.

thanks in advence

[LukyBastard2]

i fixed it