Show / Hide file extensions in Windows 7

By default Windows 7 hide file extensions of files like .txt .pdf .jpg .doc etc.
But some users may want to show file extensions.

You can show / hide file extension of files in Windows 7. Method is same as in previous versions of Windows.

• Open Computer Explorer
• Click the Organise button located in the top left of the explorer and then click Folder and search options.
  
• Click view tab.
  
• Check option “Hide Extensions for known file types” to hide file extensions. Uncheck this option to show file extensions.
  
  Click Apply and then OK button.