Black screen

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Hello Rimworld community. I recently downloaded the game yesterday and use the Rinworld466win file to open the game. I saved my game yesterday woke up this morning and my screen when I open it up through the same Win file it goes to a black screen.
I'm not very intelligent at all this computer stuff and I'm sure it's some stupid mistake.
I have NO mods nor have I tried to download them
I use windows 7
Thanks guys

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It seems like I got it working I unzipped the file again and I have my saves and all I will see what will happen from now on. If you were going to submit help might as well and help some other people? XD