Open File Definitions Note: The Close… button allows you to close files which are currently open. It must be used very carefully as it can close files which are still being used by another application resulting in, among other things, probable loss of data and perhaps a corrupted file. It should only used by experienced programmers, primarily for the purpose of closing files which were left open when a program crashed. There are subsequent warnings and prompts should you click on this button. Also, if you hold down the