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Office 2007 Bible by Lisa A. Bucki, Gavin Powell, Michael R. Irwin, Peter G. Aitken, Michael R. Groh, Cary N. Prague, Faithe Wempen, Herb Tyson, John Walkenbach

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Dealing with Attachments

One of the most common ways for viruses to spread is by means of e-mail attachments. However, all attachments are not equal in their ability to spread a virus. Certain file types are potentially very dangerous, such as executable programs, batch files, and installation files. Others, such as image and music files, are generally safe.

Automatically blocked attachments

Because of the potential danger posed by some file types, Outlook blocks certain kinds of attachments that are sent to you; you receive the message with a notification that an unsafe attachment has been blocked. This blocking is built into Outlook and cannot be turned off or changed. The blocked file types are listed in Table 28-1.

Table 28-1. File Types That Are Blocked by Outlook
ExtensionFile Type
ADEAccess Project Extension (Microsoft)
ADPAccess project (Microsoft)
APPExecutable application
ASPActive Server Page
BASBASIC source code
BATBatch processing
CERInternet Security Certificate file
CHMCompiled HTML jelp
CMDDOS CP/M command file, or a command file for Windows NT
COMCommand
CPLWindows Control Panel Extension (Microsoft)
CRTCertificate file
CSHcsh script
DERDER-encoded X509 certificate file
EXEExecutable file
FXPFoxPro compiled source (Microsoft)
HLPWindows Help file
HTAHypertext application
INFInformation or Setup file
INSIIS Internet Communications settings (Microsoft)
ISPIIS Internet Service Provider settings (Microsoft)
ITSInternet Document Set, Internet Translation
JSJavaScript source code
JSEJScript ...

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