Configure attachment icons You can configure the icon that appears beside an attachment of a particular file type. Determine the path of the image file. If desired, upload a new image. Navigate to System UI > Attachment Icon Rules. Open an existing rule or click New to create a new rule. Enter the rule details. Field Description Select icon by Select MIME Type or File Extension.Note: If a file type has an icon specified by MIME Type and a different icon specified by File Extension, the MIME Type icon takes precedence. MIME type If Select icon by is MIME Type, enter the MIME type and subtype to associate with the icon, separated by a slash (example: application/pdf). File extension If Select icon by is FIle Extension, enter the file extension to associate with the icon beginning with the period (example: .pdf). Icon Enter the path to the icon image file (example: images/icons/attach_pdf.gifx) Click Submit or Update.