| ism | ESI ITI SimulationX Encrypted Model |
| ISAM Database |
| isml | IIS Smooth Streaming Publishing Point Definition |
| iso | Cimagraphi ISO CAD Data |
| Fire Dynamics Simulator Iso-surface Data |
| InstallShield Uninstall Data |
| iso-fmr | Finger Minutiae Marker Database |
| isoe | ISO Builder Data |
| ispc | Image Surfer Pro Collection |
| ispd | Shimadzu LabSolutions IR Data |
| isr | InstallShield Uninstall Information |
| iss | Caseware IDEA IDEAScript |
| Inno Setup Script |
| ist | IsoStar Library of Intermolecular Interactions Data |
| MakeIndex Style Index |
| istg | Imagine Staging File |
| istr | IsoStar Library of Intermolecular Interactions Data |
| isu | CRiSP Harvest ISU Data |
| isv | IDL iTools Saved State |
| isw | Intuit Statement Writer Data |
| ZoneAlarm ForceField Data |
| iswp | iTunes iOS Software Update Data |
| is_ | Compressed ISP File |
| it3 | Internet Timer 3 Log |
| ita | Unreal Engine Italian Language Data |
| itb | iTunes Database |
| itd | IRIT 3D Data |
| SDL Intermediate Translation Document |
| itdb | iTunes Database |
| ite | iTunes Extras |
| iteeth | iClone Teeth Data |
| item | DM Genie Item Data |
| itemdata-ms | Windows 8 Start Screen Item Data |
| itf | eSignal Integrated Trading Data |
| VTBuilder Intermediate TIN Format Data |
| ith | InTether Receiver Package |
| ithmb | iOS Thumbnail Data |
| iti | InterActual Skin Data |
| itk | Insight Segmentation and Registration Toolkit Data |
| itl | IntelliTipster League Data |
| ITEM ToolKit Library |
| iTunes Library File |
| itld | Infoworx Translation Library Database |
| itlp | iTunes LP Album Data |
| itm | DMDX Item Data |
| iThink Model |
| itmx | iThink Model Data |
| itn | TomTom Route Data |
| itp | BSL Interpolate Data |
| e-Record Data File |
| GROMACS Include Topology |
| Shana Informed Filler Form Template |
| SVAL Interpolated Data |
| itpc | iTunes Podcast Link |
| itr | iThink Runtime |
| itss | Microsoft InfoTech Storage System File |
| itt | IconTweaker Theme |
| itu | Sheffield Dictionary Data |
| itv | Nostalgia Emulator Intellivision ROM |
| itw | Icetips Wizard Editor Data |
| InTouch With Database |
| itx | FileNet ITX Form Template |
| IGOR Pro Text File |
| ITRANS Multilingual Transliteration Scheme Data |
| itxib | iTunes Dump Data |
| iuc | wyUpdate Client Data |
| iuf | LandMark Incremental Update File |
| ium | infoUSA Network Meter file |
| iuml | PlantUML Style Data |
| iup | Fritz Update |
| iut | SPaCIoS Tool IUT Definition |
| iv-vrml | SGI Open Inventor VRML Data |
| ivc | iView MediaPro Catalogue |
| ivd | Beyond 20/20 Microdata Dimension Data |
| Bitdefender Antivirus Incremental Database |
| ivex | Worldviz Vizard Encrypted Scene Data |
| ivl | ILOG JViews Map Data |
| ISIS Volume Output interval Data |
| ivm | Avaya Modular Messaging Voice Message |
| ivml | INDENICA Variability Modelling Language Data |
