| kct | Knit Visualizer 1.0 Chart |
| kct | Kwalitan Categories Data |
| kd | Agilent ChemStation Kinetic Disk Data |
| kd3 | Yayoi Kaikei Accounting Data |
| kdb | Doobs Database |
| kdb | KeePass v1 Password Database |
| kdbp | KeePass Fast KDBP Data |
| kdbx | KeePass v2 Password Database |
| kdd | Adobe Authorware Knowledge Display Data |
| kdf | KMESS Detector Data |
| kdf | VisiQuest Standard Data Format File |
| kdi | KD Player Skin Image |
| kdl | Kill The Deadline Data File |
| kdo | Kudo Image Browser Data |
| kdr | Kinetica Data File |
| kds | KD Player Skin |
| kdt | Medbasin Evaporation Data |
| kdx | Google Earth Import Definition |
| kdz | Kaspersky Anti-virus Database |
| ked | KEDIT Macro File |
| ked | KEDIT Macro Library |
| keepsafe | KeepSafe Folder |
| kef | KAPA mpi Exported Data |
| keg | Kieler Editor for Graphs Model |
| kegdi | Kieler Editor for Graphs GMF Notation Model |
| kek | IBM Personal Communications KEK Storage |
| kelgfile | Best Free Keylogger Log |
| ken | Player Cdcheck Compressed Data |
| kep | SapShow Training Data |
| ket | Kermeta Emitter Template |
