Invalid icon for file type '<filetype>'
.NET Framework 2.0
The icon specified in the Icon property for the selected file type is not a valid icon file. The icon must be an icon file (.ico) or an icon contained as a resource in an .exe or .dll file.
This error can also occur if an icon file has been removed from the project prior to building.
To correct this error
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Double-click the error message in the Task List to go to the file type in the File Types Editor.
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In the Properties window, select the Icon property and choose (Browse...) from the drop-down list.
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In the Icon dialog box, click the Browse button.
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In the Select item in project dialog box, select a folder and select a file that contains a valid icon.