| .hwp |
Hangul (Korean) Text Document |
| .hz |
Chinese (Hanzi) Text |
| .hbk |
Mathcad Handbook File |
| .idx |
Index File |
| .ipf |
Interchangeable Preservation File |
| .ipspot |
iPhoto Spot File |
| .iil |
CleanSweep Installation Log |
| .jis |
Japanese Industry Standard Text |
| .jnp |
Java Web Start File |
| .jtd |
JustSystems Ichitaro Document |
| .jp1 |
Japanese (Romaji) Text File |
| .jrtf |
JAmes OS Rich Text File |
| .jarvis |
Jarvis Subscriber File |
| .joe |
JOE Document |
| .kon |
Yahoo! Widget XML File |
| .klg |
KOFIA Log |
| .kwd |
KWord Document |
| .knt |
KeyNote Note File |
| .kes |
Kurzweil 3000 Document |
| .msg |
Outlook Mail Message |
| .mw |
Maple Worksheet |
| .mbox |
E-mail Mailbox File |
| .mnt |
FoxPro Menu Memo |
| .mell |
Mellel Word Processing File |