The Insert button in the "Insert File" dialog box in Outlook 2007 changes to Open when you try to attach a compressed file that has a .zip file name extension

When you try to attach a compressed file that has a .zip file name extension to an e-mail message in Microsoft Office Outlook 2007, the Insert button changes to Open. If you click the Open button, the button changes to Insert. Additionally, the .zip file does not attach, and the Insert File dialog box does not close.

This behavior may be intermittent. It is known to occur when WinZip 9 is installed on the computer.

To resolve this behavior, upgrade to WinZip 10.0 by WinZip Computing.

For information about your hardware manufacturer, visit the following Web site:

Copy and paste the .zip file to the e-mail message.

To attach a file to an e-mail message in Outlook 2007, follow these steps:

1. Open an e-mail message.
2. Click the Insert tab.
3. Click Attach File.
4. Click the file that you want to attach, and then click Insert.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.