| .kfn |
KaraFun Karaoke File |
| .kdbx |
KeePass Password Database |
| .kmy |
KMyMoney Data File |
| .kodu |
Kodu Game File |
| .kes |
Kurzweil 3000 Document |
| .kde |
KryptoStorage Container File |
| .kwm |
WebMoney Key File |
| .key-tef |
Keynote iCloud Presentation |
| .kexi |
Kexi Database |
| .k25 |
Kodak K25 Image |
| .ks |
Kickstart File |
| .k3g |
3GP Mobile Phone Video File |
| .kv6 |
Ken's Voxlap 6 Model File |
| .kag |
King Arthur's Gold Map File |
| .kcl |
NIntendo Collision File |
| .keb |
Kaspersky Virus Bases File |
| .kdz |
Kaspersky Virus Bases File |
| .ktn |
KTooN Animation Project File |
| .keystore |
Java Keystore File |
| .kodak |
Kodak Photo CD File |
| .koob |
Koob E-Book File |
| .kz |
KuaiZip Compressed File |
| .k2s |
Kaiser 2 Saved Game |
| .ksm |
Pfaff Embroidery Design File |