Editing AUTOEXEC.BAT (section)

==Dual-booting DOS and Windows 9x==
When installing [[Windows 95]] over a preexisting DOS/Windows install, <code>CONFIG.SYS</code> and <code>AUTOEXEC.BAT</code> are renamed to <code>CONFIG.DOS</code> and <code>AUTOEXEC.DOS</code>. This is intended to ease dual booting between Windows 9x and DOS.  When booting into DOS, they are temporarily renamed <code>CONFIG.SYS</code> and <code>AUTOEXEC.BAT</code>. Backups of the Windows 9x versions are made as <code>.W40</code> files.

Windows 9x also installs <code>[[MSDOS.SYS]]</code>, a configuration file, which will not boot Windows 95/98 if parameter<code>BOOTGUI=0</code> is loaded, and instead a DOS prompt will appear on the screen (Windows can still be loaded by calling the <code>WIN</code> command (file WIN.COM). This file contains some switches that designate how the system will boot, one of which controls whether or not the system automatically goes into Windows. This "BootGUI" option must be set to "0" in order to boot to a DOS prompt. By doing this, the system's operation essentially becomes that of a DOS/Windows pairing like with earlier Windows versions. Windows can be started as desired by typing <code>WIN</code> at the DOS prompt.

When installing [[Caldera (company)|Caldera]] [[DR-DOS]] 7.02 and higher, the Windows version retains the name <code>AUTOEXEC.BAT</code>, while the file used by the DR-DOS <code>COMMAND.COM</code> is named <code>AUTODOS7.BAT</code>, referred to by the startup parameter <code>/P:filename.ext</code> in the [[SHELL directive]]. It also differentiates the <code>[[CONFIG.SYS]]</code> file by using the name <code>DCONFIG.SYS</code>.<ref name="Caldera_1998_USER_1"/><ref name="Caldera_1998_USER"/><ref name="Novell_1993_FYI.M.1909"/>