|This article contains technical information regarding WinZip's usage of the MAPI protocol. It does not include any information regarding WinZip's built-in emailer. For a less technical article regarding MAPI issues and possible solutions, please see Why aren't WinZip's email features working for me?|
The WinZip features that make use of the MAPI protocol are Zip and E-Mail, Zip and E-Mail Plus, the Email button in the Actions pane, the Email button in the Share section of the Create/Share tab (or the Unzip/Share tab), and the Send ToMail Recipient (Zip and E-Mail) feature. Email features in WinZip Express add-ons, except WinZip Express for Outlook, also use MAPI.
The WinZip email features above will only be available if WinZip can successfully load the defined MAPI file (often mapi32.dll). WinZip tries to load this file out of the directory returned by the standard Windows GetSystemDirectory API call.
When using one of these features, WinZip issues the simple MAPI API called MAPISendMail, specifying the name of the open archive or the name of the Zip file to be created as a parameter. WinZip has no control over the application that will respond to the MAPISendMail command. If you have not been successful with setting the default email application (see the article in the link above), you may need to edit the registry settings responsible. To do this:
When you have finished editing the registry, close the Registry Editor and test a MAPI function. If you continue to have difficulty, please email Technical Support.