.SCF File Extension

Shell Command File

Developer Microsoft
3.0  |  15 Votes

What is an SCF file?

An SCF file is a shell command file used by Windows Explorer. Windows Explorer uses SCF files to perform certain actions, such as opening a new Windows Explorer window or showing a user's desktop.

How to open an SCF file

SCF files are not meant to be manually opened. Windows Explorer automatically loads and uses SCF files as needed.


A vulnerability in SCF files' structure allows cybercriminals to use malicious SCF files to steal a user's Windows login credentials. This attack requires only that a user view the SCF file in a folder or on their desktop. It does not require that the user open the SCF file. Thus, if you notice that you are receiving an untrusted SCF file as part of a download, you should cancel that download or attempt to delete the SCF file without viewing it.

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Programs that open SCF files


DNA Sequence Chromatogram File

Developer N/A
2.7  |  12 Votes

Stores DNA sequence information that can be analyzed using a DNA sequence viewer; similar to a .ABI file, but contains more information and is less prone to errors; may be created by the LF, Li-Cor, Beckman CEQ 2000XL, CEQ 8000, Visible Genetics OpenGene, or other sequencers.

Programs that open SCF files

SimTown Sounds File

Developer Maxis Software
1.4  |  5 Votes

Contains sounds effects and audio data used by SimTown, a small-scale version of SimCity; used to playback sounds within the game.

More Information

NOTE: SimTown may alter the standard SCF file association in Windows and cause the "Show Desktop" and "View Channels" icons in the Task Bar to change. To change the SCF file extension back to the default Windows association, follow these steps (provided by Microsoft):

  1. Select "Folder Options" from the View menu in an open window and then click the File Types tab.
  2. Select "SimTown Sounds" within the Registered File Types box and click Edit.
  3. Type "Windows Explorer Command" in the Description Of Type box and click New.
  4. Type "Open" in the Action box, and type "c:\progra~1\intern~1\iexplore.exe" in the Application Used To Perform Action box.
  5. Click the Use DDE check box and type "[ShellFile("%1","%1",%S)]" in the DDE Message box.
  6. Type "Folders" in the Application box, and "AppProperties" in the Topics box.
  7. Click OK, then Change Icon, then Browse.
  8. Choose an icon to replace the missing icon, click OK, and restart your computer.

View the visual guide for changing Windows file associations for more information about how to change file associations in Windows.

Programs that open or reference SCF files

Maxis SimTown
Maxis SimTown

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