.4FS File Extension
File TypePuppy Linux Save State File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is a 4FS file?
File system save file used by the fourth extended file system (EXT4) of Puppy Linux; stores the state of the file system at a specific point in time and can be used for resetting the file system back to that state; saved to an external file system partition, since Puppy Linux can run standalone off of a CD or .ISO file.