You cannot use Internet Explorer 6 to open a PNG file that contains one or more zero-length IDAT chunks (897242)



The information in this article applies to:

  • Microsoft Internet Explorer 6.0
  • Microsoft Internet Explorer version 6 for Windows 2000
  • Microsoft Internet Explorer version 6 for Windows XP

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

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.

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.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Internet Explorer that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product 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.

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.
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 FEATURE_IGNORE_EMPTY_IDAT_CHUNKS_KB897242 subkey to the registry:
  1. Click Start, click Run, type regedit, and then click OK.
  2. In the left pane, expand HKEY_LOCAL_MACHINE, expand SOFTWARE, expand Microsoft, expand Internet Explorer, expand Main, and then expand FeatureControl.
  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.

STATUS

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

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: 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.

Modification Type:MinorLast Reviewed:7/24/2006
Keywords:kbQFE kbHotfixServer kbIE600sp2fix kbIE600preSP2fix kbfix kbbug kbpubtypekc KB897242 kbAudEndUser