Disable Single Mode MS-DOS Applications in Windows

Posted On 2007-05-03 by FortyPoundHead
Keywords: Disable Single Mode MS-DOS Applications in Windows (Windows 9x and NT)
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This setting allows you to disable the use of real mode DOS applications from within the Windows shell.
1. Using Regedit find the key below, creating it if it doesn't already exist.
2. Create a new DWORD value, and name it 'NoRealMode'.
3. To disable the real mode DOS modify the value of 'NoRealMode' to '1', and to re-enable it again later change the value to '0'.
Note: You need to reboot for this restriction to come into force.

Key: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WinOldApp]
Value Name: NoRealMode
Data Type: REG_DWORD
Data: (0 = disable, 1 = enable)


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