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The Attachment Manager classifies files that you receive or that you download based on the file type and the file name extension. Attachment Manager classifies files types as high risk, medium risk, and low risk. When you save files to your hard disk from a program that uses the Attachment Manager [OE, Windows (& MSN?) Messenger, and IE (when downloading)], the Web content zone information for the file is also saved with the file. For example, if you save a compressed file (.zip) that is attached to an e-mail message to your hard disk, the Web content zone information is also saved when you save the compressed file. When you try to extract the contents from the compressed file, or if you try to run a file, you cannot. The Web content zone information is saved together with the files only if the hard disk uses the NTFS file system.

You can open a blocked file from a known source if you want to. To open a blocked file, follow these steps:

• Right-click the blocked file, and then click Properties
  
• In the General tab, click Unblock.