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This type of file normally contains a program, and if you double-click it, Windows will run the program. For example, DOC files most often contain Microsoft Word documents if you double-click a DOC file and Microsoft Word is installed on your system, Windows will open the file in Microsoft Word.Īs a second example, the file 'game.exe' has a file type of EXE. Windows generally uses the file type to decide how the file will be handled when you double-click the file's icon. This file therefore has a file type of DOC, and would sometimes be referred to as a DOC file or a. For example, if you have a file called 'memo.doc', the last portion of the name of the file (that is, the portion following the final period) is 'DOC'. The file type of a file, sometimes referred to as its extension, is the last portion of the name of the file.

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This issue has become so important that recent versions of Internet Explorer and of email programs such as Outlook, Outlook Express, and Windows Mail warn you when you are about to work with potentially unsafe file types.īecause Zip files can sometimes contain virus-infected files, this version of WinZip displays similar warnings in certain situations when a Zip file that you are working with contains files of potentially unsafe types. Unfortunately, because of the recent proliferation of viruses, it is no longer safe to routinely double-click files, especially files received as attachments to suspicious email messages or downloaded from untrusted web sites. It is easy to casually double-click a file received as an email attachment, or a file within a Zip file received as an email attachment.

One reason that viruses are able to spread is that double-clicking a file has historically been a safe thing to do. (An up-to-date virus scanner, scanning files in real time, will stop most infections, but the newest viruses may escape detection.) If, within your Zip utility, you then double-click the virus-infected file, the virus can run and your computer can become infected. When you receive a Zip file as an email attachment, double-clicking the attachment will open the Zip file in WinZip (or whatever Zip utility is installed on your system). Viruses are sometimes compressed inside Zip files, which are then sent as email attachments. This can happen when, for example, you double-click a virus-infected attachment to an email message. One of the most common ways in which a computer becomes virus-infected is that its user actively causes the virus to run, not realizing that the file being opened could contain a virus.

WinZip's handling of potentially unsafe file types A little knowledge and some sensible security procedures will allow you to be comfortable working with the Zip files that you receive. To help prevent virus infections on your computer, you should familiarize yourself with the information on this page. WinZip users who frequently need to work with the file types involved can easily turn the caution messages off. These warnings can be helpful for WinZip users who rarely or never need to use Zip files containing these potentially unsafe file types.

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EXE file compressed within a Zip file, to warn that you are working with a file type that could potentially contain a virus. WinZip ® displays caution messages in some situations, such as when you double-click a.