The GetVolumePathNameW function does not return the correct mount point path in Windows Vista and in Windows Server 2008

You have a volume mount point on a network share. In Windows Vista or in Windows Server 2008, when you call the GetVolumePathNameW function on the UNC path of the volume mount point to retrieve the specified mount point path, the function returns only the path of the network share. However, you expect the function to return the mount point path.

In Windows XP or Windows Server 2003, the mount path is returned as expected.

For example, you have a network share whose UNC path is \\Server\Share. In the network share, you have a volume mount point that has the UNC path \\Server\Share\MountDrive. When you pass the UNC path \\Server\Share\MountDrive\SubDir to the GetVolumePathNameW function to retrieve the mount point path, the function returns \\Server\Share. In Windows XP and Windows Server 2003, the function returns \\Server\Share\MountDrive.

Hotfix information

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 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 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, the computer must run one of the following:

• Windows Vista
• Windows Vista Service Pack 1
• Windows Server 2008

Restart requirement

You have to restart the computer after you apply this 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.

Windows Vista and Windows Server 2008 file information note

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 Vista and Windows Server 2008

For all supported x64-based versions of Windows Vista and Windows Server 2008

For all supported Itanium-based versions of Windows Server 2008

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 GetVolumePathName function, visit the following Microsoft Web site: For more information about mounted drives, visit the following Microsoft Web site: For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Additional file information for Windows Vista and Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and Windows Server 2008

Additional files for all supported x64-based versions of Windows Vista and Windows Server 2008

Additional files for all supported Itanium-based versions of Windows Server 2008