.SF File Extension

Minecraft JAR Signature File

Developer Mojang
4.1  |  31 Votes

What is an SF file?

File used by Minecraft, a 3D world construction game written in Java; saved within the Minecraft.jar file in the \​META-INF\​ directory of the .JAR archive and uses the name CODESIGN.SF; saves a digital signature used to verify the contents of the archive.

More Information

The CODESIGN.SF file is also saved with the file CODESIGN.RSA. Neither file should be modified or the game may not function properly. CODESIGN.SF was previously named MOJANG_C.SF.

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Programs that open or reference SF files


IRCAM Sound File

Developer N/A
3.4  |  10 Votes
NEW: Open your .SF file online with File Helper.View Online

Sound file format developed by IRCAM, the "Institut de Recherche et Coordination Acoustique/Musique" (from France); used for storing CSound audio samples.

Programs that open SF files

MixView Sound Sample Editor
Any audio program or plugin that supports CSound samples
MixView Sound Sample Editor
Any audio program or plugin that supports CSound samples

APK Digital Signature

Developer Google
2.0  |  1 Vote

CERT.SF is a digital signature included in an .APK (Android Package) file. It contains a hashed record of the APK file's MANIFEST.MF file. CERT.SF is typically saved alongside files named CERT.RSA and MANIFEST.MF.

More Information

When an Android developer creates an APK file, Android Studio (or whatever app the developer used to create their APK file) creates a META-INF directory in that APK file. This directory contains information used to verify the APK file's contents upon installation on a user's device, to confirm the APK file has not been tampered with between creation and installation.

Notably, META-INF includes the following files:

  • MANIFEST.MF: Contains an encoded list of all the files included in the APK file
  • CERT.SF: Contains encoded copies of MANIFEST.MF and each section of MANIFEST.MF; used as a digital signature for the app
  • CERT.RSA: Contains a digital certificate used to verify CERT.SF

How to open an SF file

CERT.SF is not meant to be opened. Upon app installation, Android references an app's CERT.SF file to confirm the app's contents have not been modified.

Programs that open or reference SF files

Included with OS

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