The program you were running exceeded the DOS limit on open files. If you still want to run this program, do the following: 1. End your program with the Restart (SHIFT+F5) command. 2. Exit QuickPascal. 3. Set FILES to a larger number in your CONFIG.SYS file. 4. Reboot your machine. 5. Start QuickPascal again and try to run your program.