How do I open zip files to download to sims 3?

After you've placed the file where you want it, right-click the file and select Open With, and select the application you wish to use to open it. If it isn't listed click to browse to the location of the file you wish to use to open it. You can also set it as the default so that next time when you double click on the file you want to launch, it will launch with the proper program.

This is a safe link where you can download winrar for free here http://bit.ly/1v2nWkq You can use winrar to unzip zip files (or to open compressed folder). 7zip or winzip are other softwares you can use for the same purpose but winrar is by far the best one. All these programs work in a very similar way: you just have to right click the file to zip or unzip any folders or files. If you don't want a trial version don't worry. The trial period of winrar never ends so you can use it for free with no limitations. With WINRAR you will be able to open all the type of compressed folder like file .zip, .rar, .7z, .7zip .iso, .tar, .jar etc... that's the main reason why I recommend it.