Microsoft KB Archive/897242

= You cannot use Internet Explorer 6 to open a PNG file that contains one or more zero-length IDAT chunks =

Article ID: 897242

Article Last Modified on 11/15/2007

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APPLIES TO

 Microsoft Internet Explorer 6.0, when used with:  Microsoft Windows 2000 Advanced Server

 Microsoft Windows 2000 Datacenter Server

 Microsoft Windows 2000 Professional Edition

 Microsoft Windows 2000 Server</li></ul>

 Microsoft Windows XP Home Edition</li></ul>

 Microsoft Windows XP Professional</li></ul>

 Microsoft Windows XP Media Center Edition 2002</li></ul>

 Microsoft Windows XP Tablet PC Edition</li></ul> </li></ul>

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Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry

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SYMPTOMS
If you try to use Microsoft Internet Explorer 6 or Internet Explorer 6 Service Pack 1 (SP1) to open an image file, the image file does not appear in Internet Explorer. Instead, a blank box appears in Internet Explorer. However, you can use the Windows Picture Viewer program to open and to view the image file.

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CAUSE
This problem occurs if the following conditions are true:
 * The image file is encoded by using Portable Network Graphics (PNG) encoding.
 * That PNG file contains one or more zero-length IDAT chunks.

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Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
You must have Internet Explorer 6 or Internet Explorer 6 SP1 installed to apply this hotfix.

Restart requirement
You must restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

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 tool in Control Panel. <pre class="fixed_text">Date        Time   Version            Size    File name -- 20-Apr-2005 21:11   6.0.2800.1504     38,912   Pngfilt.dll

Hotfix installation instructions
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.After you apply this hotfix, follow these steps to add the new  subkey to the registry:
 * 1) Click Start, click Run, type regedit, and then click OK.
 * 2) In the left pane, expand , expand  , expand  , expand  , expand  , and then expand.
 * 3) In the Edit menu, point to New, and then click Key.
 * 4) Type FEATURE_IGNORE_EMPTY_IDAT_CHUNKS_KB897242 to name the new key.
 * 5) Click FEATURE_IGNORE_EMPTY_IDAT_CHUNKS_KB897242, point to New in the Edit menu, and then click DWORD Value.
 * 6) Type iexplore.exe to name the new value.
 * 7) Right-click iexplore.exe, and then click Modify.
 * 8) In the Value data box, type 1, and then click OK.
 * 9) Point to New in the Edit menu, and then click DWORD Value.
 * 10) Type explorer.exe to name the new value.
 * 11) Right-click explorer.exe, and then click Modify.
 * 12) In the Value data box, type 1, and then click OK.
 * 13) Quit Registry Editor.

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STATUS
Microsoft has confirmed that this is a problem in Internet Explorer 6.

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MORE INFORMATION
The PNG specification allows for the use of a zero-byte IDAT chunk. For more information about the PNG specification, see RFC 2083 at the following Web site:

http://www.faqs.org/rfcs/rfc2083.html

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

Keywords: kbqfe kbhotfixserver kbie600sp2fix kbie600presp2fix kbfix kbbug kbpubtypekc KB897242

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