Open Folder Options by clicking the Start button , clicking Control Panel, clicking Appearance and Personalization, and then clicking Folder Options.
Click the View tab, and then, under Advanced settings, do one of the following:
To hide file extensions, select the Hide extensions for known file types check box, and then click OK.
To display file extensions, clear the Hide extensions for known file types check box, and then click OK.
One of the main reasons for displaying the File.suffix is to help you to identify Scam Files, potentially containing Trojans or Viruses.
So when you're on the Net and download Picture.jpg onto your PC. Once on your PC you can see that it really is Picture.jpg.exe and harbours a Virus, which would be released if you clicked on it. The .exe having been hidden.
rimorman: If you have "suffixes" enabled/visible, you can see if a file is really what it says it is.
There are many ways of getting a Virus/Trojan onto your PC. Having one Download masquerading as another is just one of them.
For example: If you see a File Named: Simon Cowell & Friends.jpg, and decide to add it to your collection, you could find that it really is: Simon Cowell & Friends.jpg.exe but the .exe is written in white so that you cannot see it.
But if you have "suffixes" enabled/visible, the .exe will be visible to you, on your PC.
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