| ite | iTunes Extras |
| ith | InTether Receiver Package |
| itk | Insight Segmentation and Registration Toolkit Data |
| itl | iTunes Library File |
| itlp | iTunes LP Album Data |
| itm | iThink Model |
| itn | TomTom Route Data |
| itp | GROMACS Include Topology |
| itp | e-Record Data File |
| itpc | iTunes Podcast Link |
| itr | iThink Runtime |
| itss | Microsoft InfoTech Storage System File |
| itt | IconTweaker Theme |
| itv | Nostalgia Emulator Intellivision ROM |
| itw | InTouch With Database |
| itx | IGOR Pro Text File |
| itx | FileNet ITX Form Template |
| itxib | iTunes Dump Data |
| iuc | wyUpdate Client Data |
| iuf | LandMark Incremental Update File |
| iut | SPaCIoS Tool IUT Definition |
| ivd | Bitdefender Antivirus Incremental Database |
| ivl | ILOG JViews Map Data |
| ivm | Avaya Modular Messaging Voice Message |
| ivml | INDENICA Variability Modelling Language Data |
| ivs | Aircrack-ng Initialization Vector Data |
| ivt | Beyond 20/20 Multi-dimensional Table |
| ivw | i-Vocab World Array |
| ivx | Beyond 20/20 Micro-data Extract File |
| ivy | Apache IVY Module Descriptor |
| iw | IdleWild Screensaver File |
| iw | Chain Engineering Database |
| iwl | Incomedia WebSite X5 License Data |
| iwm | AimTech IconAuthor File |
| iwnew | Autonomy Interwoven iwdeploy Server Received File |
