| kal | CasaXPS Kratos Data |
| kal | Hondata KManager Calibration Data |
| kali | Kali Linux Related Data |
| kam | BEL Framework KAM Database |
| kan | Kwalitan Annotation Data |
| kb7 | Yayoi Kaikei Accounting Data |
| kbb | Jetico BestCrypt Key Block Backup |
| kbcim | Knowledge Master KBCIM Data |
| kbd | MountFocus Keyboard Designer Keyboard |
| kbe | KbdEdit Exported Data |
| kbf | MyInfo Document |
| kbi | Keirsey Bates Temperament Sorter Index |
| kbits | Bits'N'Picas Data |
| kbk | Medeco XT Codebooks for Keys Data |
| kbl | Altair FEKO Harness Description List |
| kbp | Keirsey-Bates Temperament Sorter Profile Data |
| kbr | Keirsey Bates Temperament Sorter Data |
| kbrf | Knowledge Master KBRF Data |
| kbs | Keyboard Script |
| kbtf | Knowledge Master KBTF Data |
| kburl | Knowledge Master URL Data |
| kbx | GnuPG Keybox File |
| kcc | KeywordConvert Combined List |
| kcd | Kayak Network Definitions Data |
| kces | eXtendable Wad Editor KCES Data |
| kcey | eXtendable Wad Editor KCEY Data |
| kcl | KeywordConvert List |
| kcm | KonyvCalc Data |
| kco | Kwalitan Codes Data |
| kcs | Keep and Share Offline Calendar Data |
| kct | Knit Visualizer 1.0 Chart |
| kct | Kwalitan Categories Data |
| kd | Agilent ChemStation Kinetic Disk Data |
| kd3 | Yayoi Kaikei Accounting Data |
| kdb | KeePass v1 Password Database |
