How to display the file extension in Windows 7 (the key lies in the Alt key)

In Windows 7, when you open the resource manager to view the file or document format, it is not visible by default, as shown in:

If a file downloaded from the Internet does not see its format, it is easy to double-click the file by mistake, resulting in viruses or the risk of Trojans being implanted by hackers, so we will introduce how to set the file extension in Windows 7:
1. First open the resource manager or double-click the computer, as shown in:

2. Click any "Alt" key on the keyboard. A new navigation bar with the tool words is displayed, as shown in:

3. Click Tools-Folder Options, as shown in:

4. On the expanded folder tab, navigate to the view tag bar and remove the sub-options that hide extensions of known file types, as shown in:

5. Click "application" and "OK". Then, open the computer and view the files or documents you want to view again.File Extension, As shown in: