You try to extract items from a .zip file that contains a folder on a computer that is running a Windows-based operating system. After you do this, you may receive the following message:

Copy File
There is already a file with the same name as the folder name you specified. Specify a different name.
Try Again | Skip | Cancel

If the computer is running Windows Vista, Windows XP, or Windows Server 2003, the file extraction operation continues after you click Skip.

Note: You may receive the same message during the file extraction. In this case, the extraction process continues after you click Do this for all current items.

If the computer is running Windows Vista Service Pack 1 or Windows Server 2008, you receive the following error message when you click Skip:

Copy Folder
An unexpected error is preventing the operation. Make a note of this error code, which might be useful if you get additional help to resolve this problem:
Error 0×800004005: Unspecified error
Try Again | Skip | Cancel

In this case, the file extraction operation fails, and a 0 (zero)-byte file, instead of a folder object, is created in the target folder.

This issue occurs when you extract the items from the .zip file either by using a drag-and-drop operation or by using the “Extract All” option.

Consider the following scenario:

• You download a compressed (zip) file from the Internet to a computer that is running one of the following operating systems:
  • Windows Vista
  • Windows Server 2003 Service Pack 1
  • Windows Server 2003 Service Pack 2
  • Windows XP Service Pack 2
• You save this file to a disk that is formatted by using the NTFS file system.
• You extract the files from the compressed file by using the Extract All Files wizard.

In this scenario, the modified date of the extracted files changes to the date that you extracted the files.

Note: This problem does not occur when you use a third-party tool, such as WinZip, to extract the files.

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When you use WinZip to extract a compressed file that has a .zip file name extension on a Windows Vista-based computer, you receive an error message that resembles the following:

This file was compressed using an unknown compression method. Please visit www.winzip.com/wz54.htm for more information. The compression method used for this file is 98. error: no files were found - nothing to do

When you try to extract and to view the contents of a Microsoft Update Standalone Package (MSU) for Windows Vista, you cannot extract the files from the MSU.

For example, one of the following issues may occur:

• If you try to use the /x command-line switch at a command prompt to extract the file on a Windows Vista-based computer, a dialog box that contains command-line help for the MSU opens.
• If you try to open the file on a computer that is not running Windows Vista, you cannot open the file. Instead, Windows prompts you to locate the program that created the file.