A typical MFC application has an About dialog as part of a resource file that can be edited in the WYSIWYG editor. Open your .rc project files and click on the About Box dialog (the default IDD is IDD_ABOUTBOX). Right-click the icon and select properties. From there you can change the icon that is used. You usually do this by adding additional icon resources to the application and specifying a new identifier. If you wish, you can simply modify the existing icon resource (the default is IDR_MAINFRAME).
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