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FIX: A ZipException exception may occur unexpectedly when you use the ZipFile class of the J# Class Libraries to extract a .zip file in Microsoft Visual Studio .NET 2003 or Visual Studio 2005

When you use the ZipFile class of the J# Class Libraries to extract a .zip file in Microsoft Visual Studio .NET 2003 or Microsoft Visual Studio 2005, a ZipException exception may occur unexpectedly. Additionally, you can find the call stack information that resembles following when you are debugging:
at ZipUtil.ZipUtility.ExtractZipFile()
  • Microsoft Visual J# .NET exposes classes in the namespace to create applications in C# to extract .zip files.
  • If you use Windows Explorer or a third-party extraction tool to extract the .zip file, this problem does not occur.
This problem occurs because of some defects in the algorithm of the ZipFile.readZIPEntries method.

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.


You must have Microsoft Visual J# Version 2.0 Redistributable Package or Microsoft Visual J# Version 1.1 Redistribute Package installed to apply this hotfix.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Microsoft Visual Studio .NET 2003

File nameFile versionFile sizeDateTimePlatform

Microsoft Visual Studio 2005

File nameFile versionFile sizeDateTimePlatform
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the usage of zip classes in the J# Class Libraries, visit the following Microsoft Developer Network (MSDN) Web site: For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
ZipException ZipFile J#

Article ID: 955132 - Last Review: 10/08/2011 06:00:00 - Revision: 3.0

Microsoft Visual Studio 2005 Professional Edition, Microsoft Visual Studio 2005 Standard Edition, Microsoft Visual Studio 2005 Team Suite, Microsoft Visual Studio .NET 2003 Enterprise Architect, Microsoft Visual Studio .NET 2003 Enterprise Developer, Microsoft Visual Studio .NET 2003 Professional Edition

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