| .id |
Lotus Notes User ID File |
| .ipsw |
iPod and iPhone Software Update File |
| .iws |
IntelliJ IDEA Web Page |
| .idlk |
Adobe InDesign Lock File |
| .icontainer |
CandyBar iContainer File |
| .inca |
InCopy CS3 Assignment File |
| .icma |
InCopy Assignment File |
| .inlk |
Adobe InDesign Lock File |
| .ifl |
3ds Max Image File List |
| .isn |
Installer Source File |
| .ind |
Adobe InDesign Document |
| .iva |
Surveillance Video File |
| .indk |
Adobe Shortcut Set File |
| .ical |
iCalendar File |
| .icalendar |
iCalendar File |
| .imageportfoliolibrary |
Painter Image Portfolio Library |
| .inm |
FaxMaster Document |
| .iix |
Translation Memory Index File |
| .iobit |
Advanced SystemCare Rollback File |
| .jad |
Java Application Descriptor File |
| .jc |
FlashGet Partial Download |
| .jc! |
FlashGet Incomplete Download |
| .jqz |
JQuiz File |
| .jcl |
JCloze File |