You would need to import the files into the Data Explorer tree, not into the detail area of a text item. And also remove any file extensions that you don't want to display internally from 'Tools | Options | Browser | File extensions to display in internal browser view', 'Tools | Options | Editor | File extensions to display in text editor', 'Tools | Options | Documents | File extensions to display in image viewer' and/or 'Tools | Options | Documents | File extensions to display in MIME viewer'.
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