No extension(s) specified for file type '<filetype>'
.NET Framework 2.0
The Extensions property for the specified file type is blank. If the Action or MIME type is specified for a file type, you must also specify at least one file extension.
To correct this error
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Double-click the error in the Task List to go to the specified file type in the File Types Editor.
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In the Properties window, select the Extensions property, and enter a properly formatted value.