Contents of the Msdos.sys File

The MSDOS.sys file is located in the Root Drive C on all Windows 9x and ME machines. It is a Hidden, Read Only, and System file. In order to edit this file you must remove the Read Only attribute. The MSDOS.sys file controls how Windows will boot. There are 3 sections to this file, the order the sections are in really does not matter.

You may edit this file in DOS with the Edit command or in Windows with Notepad.

The Paths section contains the location for the Windows folder and other basic information for booting.

(location of the Windows Folder)
(location of the Windows Folder)
(location of the Windows boot drive)
(The UninstallDir line is optional, it the location of the W9xundo.dat and W9xundo.ini files. These files are necessary to uninstall Windows. All the other lines are required. The Default is C)
(This is the Windows Version number, the one above is for Windows ME)

The Options section may be in two locations of the MSDOS.sys file, it may continue after the ;XXXXXX lines. So look all the way to the bottom of the file. It does not matter if the Options section is split or altogether. If your MSDOS.sys file does not have these options listed, Windows uses the Default Setting for the ones not in the file.

(Not available on Windows 95, determine if ScanDisk should run after a bad shutdown. 0 i does not run SacnDisk, Default is 1, 2 does not prompt before running ScanDisk)
(Default is 1; 0 will not load the GUI interface)
(Sets the amount of time in second that the "Starting Windows" message is displayed in Windows 95 only)
(Default is 1 which enables the use of the F4,F%,F^,F*, and Ctrl key. 0 disables them. If Bootkeys is set to 0 this will override the BootDelay setting)
(Default is 0, 1 displays the Startup menu)
( Sets the Startup menu for long long the BootMenu is displayed for)
.(Sets what option the Boot Menu will default to, if BootMenu is set to one)
(The Default is 1 and 0 enables the F* Keys to allow you to boot to your previous operating system)
(Default is 0; 1 forces bootup into Safe Mode)
(Default is 1 allow you to boot directly to Windows, 0 will allow you to boot directly to a C prompt or your MSDOS version)
(Default is 1 and 0 disables the Safe Mode warning message and the Startup Menu display when Windows is going to boot in Safe Mode)
(Default is 1 which automatically loads Dblspace.bin, 0 must be loaded manually)
(Default is 1 which automatically loads Drvspace.bin, 0 must be loaded manually)
(Default is 0, 1 automatically creates a Bootlog.txt file during bootup)
(Default is 0, 1 enables Double buffering and is a conditional setting that enables double- buffering for controllers that need it. 2 is an unconditional setting that enables double-buffering regardless of whether the controllers needs it or not)
(Default is1, 0 and stops Windows from loading Drvspace or Dblspace in the top 640K memory)
(Default is 1, 0 prevents the Windows Logo from being displayed during boot up)
(Default is 0, 1 adds the option to the boot menu Safe Mode with Network Support)
(Default is 1, disables the Registry Scan during bootup)

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