How to modify the file format

  
in win7 Ultimate PC 1. First, let's open a folder in the win7 Ultimate computer, feel free to open it, no matter whether there are any files. After that, in the open folder window, we click on the organization-folder option at the top of the window.

2. After that, we can open a folder option window, as shown in the figure below. Let's switch the interface to view this column in the open folder window, then find the "hidden or known extension" option in the list of advanced settings below, we will remove the checkmark in front of this option. Then click on Apply - OK at the bottom of the window.

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