In Outlook Express, you may not be able to receive and open attachments if the Virus Protection feature for attachments is enabled. This option is enabled by default in Outlook Express. If you enable this option, Outlook Express uses the Internet Explorer 6 unsafe file list and the Confirm open after download setting in Folder Options to determine whether a file is safe. Any e-mail attachment with a file type reported as "unsafe" is blocked from being downloaded.
To use the Internet Explorer unsafe file list to filter e-mail attachments, please use these steps:
1. Start Outlook Express, and then on the Tools menu, click Options.
2. Click the Security tab, and then click to select the Do not allow attachments to be saved or opened that could potentially be a virus check box under Virus Protection.
The Internet Explorer 6 unsafe file list includes any file types that may have script or code associated with them. To add additional file types to be blocked or remove file types that should not be blocked:
1. Click Start, point to Settings (or click Control Panel), and then click Control Panel (or switch to Classic View or View All Control Panel Options).
2. Double-click Folder Options.
3. On the File Types tab, click to select the file type that you want to block or allow, and then click Advanced. If the file type you want to add is not listed, perform the following steps:
a. Click New.
b. In the Create New Extension dialog box, type the file extension you want to add to the unsafe file list.
c. Click OK, and then click Advanced.
4. Click to place a check mark (block) or remove the check mark (allow) from the Confirm open after download check box.
NOTE: You cannot remove the check from Confirm open after download to allow some file types. For example, .exe files are in the default unsafe file list in Internet Explorer and cannot be allowed.
If you would like to view detailed information about the above steps, please visit the following Microsoft Knowledge Base Article:
Article Title: Using virus protection features in Outlook Express 6
http://support.microsoft.com/?kbid=291387
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