Guide to displaying file extensions on Windows for system security.

By default, Windows hides file extensions (such as .exe, .pdf, .jpg) to give the interface a cleaner look. However, this is a serious vulnerability that hackers frequently exploit. These extensions act as the file's "identity card," helping the operating system and the user know exactly what type of data is about to be opened.

Understanding file extensions not only helps you manage your data professionally but also serves as the first line of defense in detecting disguised malware (for example, a virus file disguised as an image beauty.png.exe). With just a few simple steps, you can significantly improve the security of your PC.

Ways to display file extensions

Method 1: Using File Explorer (Fastest)

 

1. Press the Windows + E key combination to open File Explorer.
2. On the toolbar at the top, select the View option .
3. Hover your mouse over the line Show > Check the File name extensions option .

Method 2: Enable in Windows Settings (For Developers)

 

1. Press Windows + I to open Settings.
2. Select System > For developers .
3. Find File Explorer and toggle the Show file extensions slider to On .

Method 3: Using PowerShell/Terminal (For professional users)

If you want to execute it quickly using a command, paste the following line into PowerShell (with administrator privileges):

reg add HKCUSoftwareMicrosoftWindowsCurrentVersionExplorerAdvanced /v HideFileExt /t REG_DWORD /d 0 /f

Then press F5 to refresh File Explorer.

Beware: 4 Deceptive Tactics Used by Hackers

Once you've revealed the file extension, be aware of the following sophisticated techniques commonly used by attackers:

Technique	How to identify
Dual Extension	The file has the format document.pdf.exe. If you see the extension . .exe, absolutely do not open it.
Overwrite RTLO	Use special characters to reverse the name, for example, image.exe.jpgwhich is essentially an executable file.
Whitespace Padd	Insert hundreds of spaces to push the .exereal tail out of sight.
Fake Icon	A file .exethat uses a Word or PDF icon to deceive the eye.

Frequently Asked Questions (FAQ)

Why does Microsoft hide file extensions by default?

1. To optimize the user experience for the average person, file names should be shorter and easier to read.

Does the current file extension slow down the computer?

1. Absolutely not. This is just an option to display the Windows interface.