New IDEA xml file is displayed as plain text text

• When a new Intellij IDEA xml file, the file contents can not be highlighted, a text file is text logo pattern
• But you can create other named xml file
• Here are two kinds of reasons

• Select and click the minus sign in the list below, delete the text in the text * .xml, if there is no need to delete

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• Add in XML * .xml, if there is no need to add

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• If you still can not resolve, then look at the picture below to see if there Mapper more than just a creation of their own
• After you delete can re-create the xml file to a previously named.

• If you solve the above problem, a point like this, thank you!