Open your iPhone email client or Web browser, depending on whether you are opening an email attachment or a ZIP file from the Internet. Tap the ZIP file and then tap the "Open in WinZip" button.

The world’s most popular compressed file format doesn’t play all that nicely with smartphones. Try and open a Zip file on iOS or Android and you’re likely ...

You no longer need third-party apps if you want to open zip files on iOS. Rar files? That's another story.

How to Open a Zip File in Excel 2007. A ZIP file usually contains several other files that have been compressed to a smaller size and bundled into a single package with a .zip filename extension.