A user who has Contributor permissions for a shared folder in Windows Vista can delete files and folders that have been created by other users

You use the File Sharing Wizard in Windows Vista to share a folder, and then grant Contributor permissions to a user for that folder. However, when the user tries to access the folder, the following problems may occur:

• The user cannot locate the folder.
• The user can delete files or folders that have been created by other users.

The user may be unable to locate the shared folder if the following conditions are true:

• You share a folder that resides in your profile path on the Windows Vista-based computer. For example, you share the following folder:
  drive:\Users\UserName\SharedFolder
  Note UserName is your profile name. SharedFolder is the name of the shared folder.
  
  In this case, a user who has Contributor permissions must know the full path of the shared folder before the user can view the shared folder. For example, a user must have the following information:
  \\ComputerName\Users\UserName\SharedFolder
  Note ComputerName is the name of the Windows Vista-based computer.
• You share a folder that does not reside in your profile path on the Windows Vista-based computer. For example, you share the following folder:
  drive:\SharedFolder
  In this case, a user who has Contributor permissions only has to know the computer name to view the shared folder.

In both these cases, a user who has Contributor permissions can delete files and folders that other users have created.

Note Contributor permissions are only available when you share a folder. Contributor permissions do not appear when you share files.

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