Exceptions that are thrown from a 64-bit application that is running in the 64-bit editions of Windows Server 2003 or of Windows XP Professional are silently ignored

Consider the following scenario:

• You develop a 64-bit application to run on a 64-bit edition of Windows Server 2003 Service Pack 2 or on Windows XP Professional x64 Edition Service Pack 2.
• When the application is running, an exception is thrown in a callback routine that runs in the user mode.

In this scenario, the exception does not cause the application to crash as expected. Instead, the application enters into an inconsistent state. This causes the application to throw a different exception and crash.

Hotfix information for Windows Server 2003 Service Pack 2

A supported hotfix is 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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, your computer must be running Windows Server 2003 Service Pack 2 on a 64-bit edition Windows Server 2003.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

How to enable this hotfix

For more information about how to enable this hotfix, see the "MORE INFORMATION" section.

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.

Windows Server 2003 with Service Pack 2, x64-based versions

Windows Server 2003 Service Pack 2, Itanium-based versions

Hotfix information for Windows XP Professional x64 Edition Service Pack 2

A supported hotfix is 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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, your computer must be running Windows XP Professional x64 Edition Service Pack 2.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

How to enable this hotfix

For more information about how to enable this hotfix, see the "MORE INFORMATION" section.

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.

Windows XP Professional x64 Edition with Service Pack 2

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

How to enable this hotfix

By default, this hotfix is not automatically enabled after you apply it. You must manually enable this hotfix at the system level or at the process level. After you enable this hotfix, the exception will be escalated to the Windows kernel to be processed.

When you enable this hotfix at the system level, all the processes that are running in the system are affected. When you enable this hotfix at the process level, only that specific process is affected. The hotfix setting at the process level supersedes the hotfix setting at the system level.

To enable this hotfix at the system level, follow these steps:

1. In Registry Editor, locate the following registry subkey:
   HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
2. Create a registry entry of the DWORD value.
3. Name the new registry entry DisableUserModeCallbackFilter.
4. Set the value of the DisableUserModeCallbackFilter registry entry to 1.

To enable this hotfix at the process level, follow these steps:

1. In Registry Editor, locate the following registry subkey:
   HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
2. Create a registry subkey.
3. Name the new registry subkey with the name of the process that you want to enable the hotfix on. For example, if you want to enable this hotfix on the Notepad.exe process, you name the new registry subkey "Notepad.exe."
4. Under the new registry subkey, create a registry entry of the DWORD value.
5. Name the new registry entry DisableUserModeCallbackFilter.
6. Set the value of the DisableUserModeCallbackFilter registry entry to 1.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: -