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Download Zip, the fun app that will tally votes from other users quickly and anonymously to answer life's opinion-based questions. Zip is built, designed and fun for all ages so you can resolve friendly squabbles, debates and arguments before they turn into wars. App maker: Trump will win election.
An .ipa file is a zip-file. You can open it by renaming it's extension to zip. But as Michael said, you will not be able to see how the app works without the source code and this is not part of the zip-file. It contains some more or less interesting stuff like e.g. resources.