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Consider the following scenario. In Windows Vista or in Windows Server 2008 you have an application that uses a common dialog box. When the application is running, the common dialog box crashes if the initial target of the dialog box points to a Server Message Block (SMB) 1.0 share on a remote computer.
Note Computers that are running Windows Server 2008 or Windows Vista support SMB 1.0 and SMB 2.0. When Windows Server 2008 or Windows Vista communicates with a Windows-based operating system that is running Windows XP or Windows Server 2003, SMB 1.0 is enabled.
This problem occurs if there are multiple virtual circuits within the connection, such as file change notifications, from the local computer to the remote computer.
This problem occurs because the Common Dialog APIs try to enumerate the remote file system so that it can display the folder and file view to the user. When the SMB command block is unavailable, the APIs crash while they wait for a command block to be freed. If the command block is not freed, the application crashes.
Microsoft has produced the following hotfix to prevent file change notifications from blocking Common Dialog APIs. However, if another operation, which uses the same kind of SMB command as the common dialog box, consumes the reserved command block, the Common Dialog APIs remain blocked.
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.
To apply this hotfix on a computer that is running Windows Vista, you must have Windows Vista SP1 or Windows Vista SP2 installed.
No prerequisites are required for computers that are running Windows Server 2008.
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
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 Vista and Windows Server 2008 file information notes
The MANIFEST files (.manifest) and MUM files (.mum) installed for each environment are listed separately. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows Server 2008 and of Windows Vista
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
For all supported IA-64-based versions of Windows Server 2008
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
To work around this problem, follow these steps:
Click Start, type regedit in the Start Search box, and then press ENTER.
Locate, and then click the following registry subkey:
Windows Vista Business, Windows Vista Enterprise, Windows Vista Ultimate, Windows Vista Business 64-bit Edition, Windows Vista Enterprise 64-bit Edition, Windows Vista Ultimate 64-bit Edition, Windows Server 2008 Standard, Windows Server 2008 Enterprise, Windows Server 2008 Datacenter, Windows Server 2008 Standard without Hyper-V, Windows Server 2008 Datacenter without Hyper-V, Windows Server 2008 Enterprise without Hyper-V, Windows Server 2008 for Itanium-Based Systems