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Using Registry Editor in Real Mode
Article ID: Q131352
Creation Date: 08-JUN-1995
Revision Date: 01-DEC-1995
The information in this article applies to: Microsoft Windows 95
IMPORTANT: This article contains information about editing the registry.
Before you edit the registry, you should first make a backup copy of the
registry files (System.dat and User.dat). Both are hidden files in the
The registry is a system-wide database used for storing Windows 95 software
and hardware configuration settings. Windows 95 includes a Registry Editor
program (Regedit.exe) that runs in both the real-mode MS-DOS environment and
in the protected-mode Windows environment. When you need to modify the
registry without starting Windows 95, use Registry Editor in real mode.
For information about how to edit the registry, view the Changing Keys And
Values online Help topic in Registry Editor (Regedit.exe). Note that you
should make a backup copy of the registry file (System.dat) before you edit
WARNING: Using Registry Editor incorrectly can cause serious problems that
may require you to reinstall Windows 95. Microsoft cannot guarantee that
problems resulting from the incorrect use of Registry Editor can be solved.
Use Registry Editor at your own risk.
To export, modify, and then import registry data using Registry Editor in
real mode, follow these steps:
1.Restart your computer. When you see the "Starting Windows 95" message,
press the F8 key and then choose Safe Mode Command Prompt Only from the
2.At the MS-DOS prompt, type the following command:
regedit /l:c:\windows\System.dat /e c:\system.txt
3.Use any text editor (such as EDIT.COM) to modify the SYSTEM.TXT file that
you created in step 2.
4.Make the changes you want and then save and close the file.
5.To merge the text file back into the registry, type the following command:
regedit /l:c:\windows\System.dat c:\system.txt
The changes you made take effect the next time you start Windows 95.
The syntax and command-line switches for REGEDIT in real mode are as
REGEDIT [/L:system] [/R:user] filename1
REGEDIT [/L:system] [/R:user] /C filename2
REGEDIT [/L:system] [/R:user] /E filename3 [regpath]
/L:system Specifies the location of the System.dat file.
/R:user Specifies the location of the User.dat file.
filename1 Specifies the file(s) to import into the registry
/C filename2 Specifies the file to create the registry from.
/E filename3 Specifies the file to export the registry to.
regpath Specifies the starting registry key to export from.
(Defaults to exporting the entire registry).
To see this list, type "regedit /?" (without quotation marks) at the MS-DOS