Microsoft KB Archive/168050

= Access Violation in Explorer when Viewing *.ht file Properties =

Article ID: 168050

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q168050



SYMPTOMS
If you have a debugger running and you open the property page for a hyperterminal session file (*.ht), and then close the property page, you will receive an access violation in Explorer.exe.

NOTE: *.ht files can be found in %winnt%\Profiles\ \Start Menu\Programs\Accessories\Hyperterminal.



CAUSE
HyperTerminal calls RegOpenKey to duplicate a handle to a registry item. But RegOpenKey does not duplicate the handle, it just returns the one you gave it (for example, the Shell's handle). Later, the HyperTerminal .dll closes this handle, and then the shell attempts to close the handle that was already closed by HyperTerminal.



RESOLUTION
HyperTerminal now uses RegOpenKeyEx, which does give back a new handle to the same item (in other words, duplicates it correctly), instead of RegOpenKey.



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem was corrected in the latest Microsoft Windows NT 4.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: prodnt dr watson

Keywords: kbbug kbfix kbinterop KB168050

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