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E-mail is a method of transferring files between individuals on the Internet or sending them to a specific list of people E-mail is easy to use and well suited for smaller attachments, especially if you zip them first, but FTP or web transfer is better for larger attachments or for executable file types Most e-mail programs make attaching files to messages very simple; you just need to attach the file and send Because e-mail was originally designed for text only, attachments need to be converted to a text-like data format before sending, using a process called encoding All newer Windows e-mail programs handle the conversion automatically, and utilities exist to encode attachments for use with older e-mail programs There are three different types of encoding, and both the sender and receiver must use the same method Many Windows e-mail programs support all three methods, which are I Multipurpose Internet Mail Extensions (MIME) Internet standard Increasingly, MIME is the
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File Transfer by Web, FTP, and Peer-to-Peer
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I Uuencoding I BinHex
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These methods are necessary because e-mail protocols were originally designed to handle only plain text messages When a file is attached to an e-mail message, it is actually appended to the text message with a header that tells the receiving e-mail program how to decode it The e-mail program trims off the remaining data and converts it to the appropriate file If your e-mail program doesn t decode the message, the body of the message will contain large blocks of random text at the end If you use Outlook Express, you can see what an encoded attachment looks like First select a message that has an attachment; then select File | Properties | Details tab and click the Message Source button Scroll toward the end of the message until you see a block of random text like this:
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This sample shows a MIME-encoded attachment However, attachments encoded with uuencode and BinHex have the same type of random text in the message source If you do receive such a file, examine the first few lines of text that follow the e-mail message for the words uuencode or binhex as a clue to the encoding method Then check to see if your e-mail program allows you to choose that method If not, ask the sender to resend the message using a different attachment encoding scheme Another alternative is to download from the Web one of the uudecode or BinHex decoding utility programs available, such as WinCode Save the e-mail message as a text file, open that text file in your decoding utility, and the utility will reconstruct the original file For the full details of transferring files by e-mail, see 7
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Internet: The Complete Reference
Many corporations and individuals block many types of e-mail attachments or delete messages containing attachments to reduce the risk of computer virus infections Many e-mail mailing lists strip attachments from messages posted to the list If you need to send attachments, it may be better to upload them to a web or FTP server and provide the URL so that others can download the file AOL users can attach files to their messages to non-AOL users, and they usually arrive as MIME attachments, but AOL attachment support can be spotty
Transferring Files via the Web
By far the most popular form of file transfer is to download files from the Web, especially free or trial software (described more fully in the next chapter)
Downloading Files with Your Browser
How does your browser handle this file transfer process Sometimes the link you click to begin downloading a file actually redirects your browser to an FTP server, which is described in the section Transferring Files Using File Transfer Protocol (FTP) later in this chapter The browser then turns over the job to its internal FTP client software (or to the operating system s FTP client utility) to transfer the file You can browse other sites on the Web during the download, although your browsing may be slowed by the ongoing download process If the link you click to download a file does not redirect your browser to an FTP server, the web server delivers the file itself When a web browser begins to receive a file from a web server, it examines the file s type It either looks for information from the server as to the MIME type of the file (for example, text/HTML for web page files), or it looks at the file s extension (for example, gif for pictures) Browsers focus on displaying files, not saving them, so if the browser knows how to display a given type of file, it does so If it does not know how to display the file, it checks to see if it has any helper software that can display the file: a plug-in or a viewer program Failing that, it asks you if you want to save the file If you choose to save the file, you can proceed to browse other sites while the file downloads Browsers are increasingly clever about recognizing file types, however, so they attempt to display or play a file rather than simply save it Some browsers can recognize a file as being a plug-in or other add-on component for the browser itself They can then automatically install that component, given your approval, or they recognize that they are receiving a file that is executable (a program) on your computer and ask you if you want to run the program once it downloads Some browsers can check with your computer about what program it associates with certain file types and run that program even within the browser window itself Increasingly, a browser, recognizing that it lacks the necessary viewer or plug-in to display a file, offers to download the required software
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