Uncheck the box next to Hide file extensions for known file types 2.In the Folder Options windows, click on the View tab.Select the Tools menu, & then select Folder Options….If you don’t see My Computer, then open any folder. On the View tab, uncheck the box next to Hide file extensions for known file types.Select the View menu, & then select Folder Options.On the View tab, uncheck the box next to Hide MS-DOS file extensions for file types that are registered.Select the View menu, & then select Options.However, Microsoft keeps changing the means by which you can set your computer to reveal the extension, so make sure you use the correct method for your version of Windows. Without a visible extension, it would have been impossible to tell just by looking that the attachment was dangerous. shs, a type of file that virtually no one should ever open. The Anna Kournikova virus used an extension that ended with. html! In one case, a student had a file that appeared to be named settings.json but wasn’t getting processed as a JSON file once we turned on extensions, we discovered it was actually named - no wonder it wasn’t working correctly!įurther, seeing the extension can be a big help in preventing malware. htm can be extremely helpful, especially if you’ve got an accidental link to the file using. This is easily fixed, and it is important that you fix it, especially if you are going to be making Web pages. txt after it, or an image might be missing the.

docx on the end of the filename, or a text file might not have. For instance, a Microsoft Word document might not have. Unfortunately, many Windows machines are configured so that they hide the “dot 3” extension after a file name in other words, the 3 (sometimes 4) letter extension that identfies the type of file does not appear.

File extension desktop