.SFS File Extension
File Type 1Kerbal Space Program Save File
What is an SFS file?
File created by Kerbal Space Program (KSP), a game where players build and manage a space program; saves the state of the game as a file called persistent.sfs; allows the game to be resumed.
Kerbal Space Program allows users to create "quicksaves" of games and revert back to previous states of the game in case the rocket crashes. When the game creates the quicksave, it stores the contents in the quicksave.sfs file.
persistent.sfs - The file in the saved game folder that stores the state of the game and allows the game to be resumed from the "Resume Saved" dialog.
File Type 2Squashfs File Archive
.SFS File Association 2
Read-only archive format developed for Linux-based operating systems; often used for creating installer archives and software distributions; typically compressed using .GZIP compression.
SFS files are also used for installing updates on Navigon-based GPS devices.
NOTE: Some users have reported that 7-zip is unable to extract SFS files. If you're having trouble, uninstall 7-zip and install 7-zip 9.25 alpha. This version will open SFS files.
File Type 3SFX Sample File
.SFS File Association 3
File created by sfxr, a program used to make sound effects; stores sound settings such as the attack time, sustain time, frequencies, cutoffs, and filters; can be used for making video game sound effects.
SFS files can be exported to .WAV files in the software.
NOTE: There exists a Mac version of sfxr that is called cfxr ("Cocoa sfxr"). However, cfxr cannot open SFS files. It uses its own XML formatted .CFXR files.