Creating a .unity3d file

So Im trying to upload one of the unity games that I created onto a website, but everything I look at is telling me that I need a .unity3d file to upload onto the server. Ive looked through all of my various different Unity projects but not one of them has a .unity3d file in it. So I was wondering exactly how you go about making one so that I can upload my games.

You need to change the platform in File – Build Settings… – select web player – switch platform. Then if you build your game it will create a basic html and your .unity3d file

For anyone looking to do this in 2020 you must download the 2014 version of unity. first go into Unity Hub – installs – Download Archives – Unity 4.x I’m using version 4.6.1,For anyone looking to do this still in 2020 you have to go into Unity Hub – installs – Download Archives – Unity 4.x then download a version from 2014 I’m using version 4.6.1