Problem with avid codec le installation

Hello,
I am using Window 7 on my computer. I have downloaded Avid Quick Time Codec LE 2.3.8 from the internet. I am wondering how to install it, because it is not zip or exe file.
Please tell me avid codec le is the corrupted file? I think may I have incorrect installer Or there is a compilation problem with installer? I don’t know what the problem please helps me out.
