If you place an Autorun.inf file in the root folder of a CD or DVD and the Autorun.inf file contains an OPEN command pointing to a program file (e.g. OPEN=MYAPP.EXE), the program is launched automatically when you insert the CD/DVD in a drive. But if you place the same Autorun.inf file and program file on a USB flash drive and plug the drive to a USB port in a computer, the program is very likely not started automatically. Instead is a Windows menu shown, which contains a list of actions (options) that you can choose between to handle the USB drive.
