GP Fault in Windows NT VDM When Using SCROLL_LOCK/UNLOCK

Last reviewed: September 17, 1996
Article ID: Q152547

The information in this article applies to:

Microsoft Windows NT Workstation version 3.51
Microsoft Windows NT Server version 3.51

SYMPTOMS

The following sequence of operations generates a general protection fault (GPF) in the target Windows NT Virtual MS-DOS Machine (VDM) :

In ControlPanel, double-click the International icon and change the Keyboard Layout to something other than US (French, German, Spanish, UK, and so forth).
Open a Windows NT VDM window.
Start a 16-bit application, such as edit file.txt.
Press the SCROLL_LOCK/UNLOCK key once or twice.

This generates a GPF in the VDM.

NOTE : the problem does not happen with Keyboard Layout set to US.

RESOLUTION

Upgrade to Windows NT 4.0, or obtain the fix referenced below.

In the absence of side-effects, a solution will be included in Windows NT 3.51 Service Pack 5. The problem is also fixed in Windows NT version 4.0. The file concerned is Ntvdm.exe

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 3.51 Service Packs 1 through 4.

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Last reviewed: September 17, 1996
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