| Extension Name | Extension Type | Category | Dev.Company | File Format |
|---|---|---|---|---|
| .4FS File Extension | Puppy Linux Save State File | Data | Puppy Linux | Unknown |
| .2FS File Extension | Puppy Linux Save State File | System | Puppy Linux | Binary |
| .3FS File Extension | Puppy Linux Save State File | System | Puppy Linux | Binary |
| .ATAHD File Extension | ATA Hard Drive Flag File | System | Puppy Linux | Unknown |
| .ME File Extension | Puppy Linux Partition Flag File | System | Puppy Linux | Unknown |
| .PUP File Extension | Puppy Linux DotPup Installer Package | Compressed | Puppy Linux | Binary |