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Invalid extension '<extension>' in AppMappings for folder '<folder>'
An extension listed in the AppMappings property of the specified folder is not a valid file extension. Multiple extensions must be separated by semicolons; it is not necessary to prefix an extension with a period.
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 AppMappings property. Click the Ellipsis () button to open the Application Mappings dialog box.
- Select the mapping for the extension specified in the error message, and click the Edit button to open the Application Extension Mapping dialog box.
- Enter a valid file extension in the Extensions field. Extensions must be preceded by a period; multiple extensions should be separated by semicolons.