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MCSE : Security Specialist OS Fundamentals part 1 The values in Io.sys cannot be edited, to override values in Windows 9x Io.sys, place the entry in Config.sys with the value you want. For example Io.sys does not load Emm386.exe. If any of your applications requires expanded memory or loads data into the high memory area, EMM386 must be loaded in Config.sys. BOOT.INI Used in Win NT and 2000 (see below) WIN.COM performs checks and loads the core components of Windows. (Kernel, User and GUI) If windows is not shut down properly, WIN.COM will run Scandisk. You can type WIN at the command prompt to start Windows. MSDOS.SYS is a hidden system file,found in root directory. It contains settings that are processed during startup. Windows renames the DOS version to msdos.dos and replaces it with its own version (see above). It is divided into two sections. Example MSDOS.SYS file Paths   WinDir=C:\WINDOWS  Defines the location of the Windows 9x Windows directory as specified during Setup.   WinBootDir=C:\WINDOWS Defines the location of the necessary startup files. The default is the directory specified during Setup.   HostWinBootDrv=C Defines the location of the boot drive root directory.   Options   BootMulti=1 Enables dual-boot capabilities. The default is 0. Setting this value to 1 enables the ability to start MS-DOS by pressing F4 or by pressing F8 to use the Windows Startup menu.   BootGUI=1 Enables automatic graphical startup into Windows 9x. The default is 1.   AutoScan=1  Enables ScanDisk to run automatically when your computer restarts. The default is 1. When this value is set to 1, ScanDisk will run automatically, setting this value to 0 disables this feature.    Logo=1  Enables display of the animated logo.          AUTOEXEC.BAT Stands for automatically executed batch file, the file that DOS automatically executes when a computer boots up. You can put commands in this file that you want to execute when your computer executes. Win 9x does not need this file but includes it for compatibility with some older programs that use it. CONFIG.SYS DOS configuration file which loads the device drivers, not necessary to run Windows but retained for backward compatibility.