To create a new identifier and associate it with a content type:
In the Identifier box, type the file extension for which you want to associate a content type. For example, to map Microsoft Word documents, type *.doc.
Under Mapped Content Type, perform one of the following actions:
Choose an existing content type from the list.
To create a new content type, click Create Content
Type and complete the Content
Type Editor.
Click Finish to save the identifier.
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