Idk what is going on...

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I download a mod off of the fourms, get ingame, and try to load it. but when I click on the mod I want to play, instead of giving me the button that says load, I get a button that says open. I click on it and it opens as if it was a folder. inside it there is text that says _test2. when I click on it it says unable to load mod. All of this is shown in the screenshots. Please help me.