Files that contain the .qtl file extension are text files that store QuickTime movie file links. These QTL files include the location of the associated movie file and the file's QuickTime settings.
Some of the settings within the QTL file may include autoplay settings, controller settings, loop settings, etc.
When you click a QTL link, it will open the associated movie file within the QuickTime media player as long as the Web server is configured with the proper MIME type. The movie files that a QTL file references are located on a Web server and the files allow a user to download or stream the associated movie to his or her hard drive.
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If you have additional information about the QTL file format or software that uses files with the QTL suffix, please do get in touch - we would love hearing from you.