If you want to rename a file in your project, you should rename it within the StarTeam application. This retains the properties associated with that file, such as history and links.
If you rename a file outside the application (for example, by using Windows Explorer), the application considers the file to be a new file. When you add the file with the new name, it will have no connection to the history, links, or other properties of the original file.
StarTeam renames the file in both the StarTeam repository and in your working folder.