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.

If you use Yahoo for your email account, you can open attachments easily, and Yahoo will even scan attachments for you to check for viruses or potential threats to your system.

By installing Attachment Icons for Gmail, you'll be able to quickly identify if it's a PDF, MP3, ZIP, or any other common file type attached to your e-mail without even having to open it.

Mac 911 How to open a stubborn email attachment in Mail on your Mac Apple Mail may wind up with broken permissions that prevent you from opening files you should have access to.