![]() They do this by distributing files that appear to be harmless, but are in fact an executable file that will execute when you attempt to open it.įor example, let's say you are sent an email with the zip file attachment and when you unzip it, you see that there is a file called presentation.ppt. Even more serious is the fact that many malware creators create their infection files so that they exploit this default setting. In reality, though, when you double-click on it, it would instead open in Notepad because its true, but not visible, extension is actually. From this file name, you would then assume this is a Word document because it looks like it has a. To show what this means, if you have a file called, Windows will only display test.doc. Therefore, when viewing files in Windows you would only see the portion of the file name that precedes the last period in it. The default setting for Windows is to not display a file's extension, which is the last period in a file name followed by 2 or 3 letters. 4 How to view file name extensions in Windows 8 and Windows 10.3 How to view file name extensions in Windows Vista and Windows 7.2 How to view file name extensions in Windows XP.
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