Invalid MIME type(s) in list '<list>' of file type '<filetype>'
A MIME type listed in the MIME property of the specified file type is not a valid MIME type. The MIME property takes the form application/type where application represents either your application or a class of applications (such as video), and type represents a unique MIME type. The forward slash is required. You can specify more than one MIME property by separating the properties with a semicolon.
To correct this error
- Double-click the error in the Task List to go to the referenced file type in the File Types Editor.
- In the Properties window, select the MIME property, and correct any invalid MIME types.