| i5s | IUCLID5 Compressed Backup |
| i5z | IUCLID5 Export File |
| i61 | Nokia 6100 Icon Data |
| ia6 | IApproach Work Data |
| ia64 | HP-UX IA64 Data |
| iab | DB/TextWorks Image Annotation List Backup |
| iab | Iomega Automatic Backup Data |
| iad | Source Insight Auxiliary Symbol Index |
| iad | Symantec Patch Management Solution Data |
| iadaction | iAd Producer Plugin Action Template |
| iadclass | iAd Producer Plugin Class Description |
| iadcomponent | iAd Producer Component |
| iadpage | iAd Producer Page Template |
| iadstyle | iAd Producer Style Template |
| iaf | ASAP Data |
| iak | Mail.dat Information Access Key |
| ial | Microsoft SharePoint List Activity Data |
| ias | Bitdefender IAS Data |
| ias | Intermodulation Analysis System Data |
| iati | International Aid Transparency Initiative Data |
| iavatar | iClone Avatar |
| iaw | ImageAMMO Wrapper |
| ib | Embarcadero InterBase Database |
| iba | MDE InfoHandler Infobase |
| ibadr | IsoBuster Address Data |
| ibak | Password Safe Intermediate Backup Archive |
| ibank | iBank Accounting Data |
| ibc | Incredibar Toolbar Content |
| ibc | Microsoft Outlook InterConnect Bizcard Data |
| ibc | PLINK GCTA Inbreeding Coefficient Report Data |
| ibd | Microsoft Windows Installer Exported Database |
| ibd | MySQL InnoDB Tablespace |
| ibd | Symantec Patch Management Solution v7 Data |
| ibe | IBECrypto Encrypted File |
| ibg | iBridge Project Workspace Data |
| ibg | ImgBurn Graph Data |
| ibk | IncrediMail Account Backup Data |
| ibk | Treepad Database Index Backup |
| ibl | PCLTool Index Location Data |
| ibl | PTC Creo Blend Feature Data |
| ibl | sIBL System Data |
| ibn | WinIQSIM Data |
| ibo | IB Objects Data |
| ibp | CLIC RAW Data |
| ibr | IsoBuster Saved Search Data |
| ibs | IBIS Data |
| ibs | IBM i2 iBase Data |
| ibs | Incredibar Toolbar Skin Data |
| ibt | IGOR Pro Binary Misc File |
| ibu | MariaDB InnoDB Undo Log |
| ibv | IGOR Pro Binary Variable File |
| ibw | IGOR Pro Binary Wave File |
| ibx | Interscope BlackBox File |
| iby | Symbian ROM Image Component Include |
| ibz | MySQL InnoDB Database Table Compressed Backup |
| ib_lic | IncrediBuild License Data |
| ic | Sony Ericsson Icon Pack |
| ic | SPICE Initial Condition Data |
| ic0 | HSPICE Initial Conditions Data |
| ic4 | SADiE Interchange Data |
| ica | BrainVoyager QX Independent Component Analysis Data |
| ica | Identity Compass Encrypted Answers Data |
| icalevent | iCal Event Data |
| icaltodo | iCal To Do List |
| icbu | iCal Backup |
| icc | ICC Profile |
| icc | IconUtils Icon Collection |
| icc | IronCAD Catalog Data |
| iccp | Identity Compass Encrypted Culture Profile |
| icd | Actuate e.Report Information Object Cache Definition |
| icd | ASTi Model Builder ICD Data |
| ice | CoolTalk Invitation Data |
| icf | Cheyenne AntiVirus Data |
| icf | Imabas Data |
| icf | RapidForm INUS Compression Format Data |
| icg | Image Comparer Database |
| ichat | iChat Saved Log |
| ici | AMPAC ICI Data |
| icl | ArtIcons Icon Library |
| icl | Mail.dat International Container Label File |
| icloud | iCloud Drive Temporary File |
| icm | Image Color Matching Profile |
| icm | Integrated Climatic Model Data |
| icmod | Inner Core Minecraft PE Mod Data |
| icms | RagTime Data |
| icn | AutoCAD Civil 3D Subsurface Interpolation Control |
| icn | OpenFlight Model |
| icns | Mac OS X Icon Resource File |
| iconbox | IconBox Data |
| iconboxicon | IconBox Icon Data |
| iconfig | iConfig Data |
| icontainer | CandyBar iContainer Data |
| icp | Identity Compass Encrypted Profile |
| icq | ICQ Archive Data |
| icq | QIP Infium ICQ Data |
| icr | Image Comparer Results Data |
| icr | Impromptu Content Report |
| icr | NCSA Telnet Interactive Color Raster Data |
| icsalarm | iCal Alarm Data |
| ict | Cadence ASCII Interconnect Technology File |
| ictx | FilePic Transport Container |
| icursorfx | iCursor Effect |
| icw | Internet Explorer Internet Connection Wizard Data |
| icx | Windows CE Remote Call Profiler Summary View |
| icxs | iTunes Internal Data |
| id | AMD SimNow Product Data |
| id | AOL Instant Messenger Buddy Icon |
| id | Lotus Notes User ID File |
| id2 | Live Messenger Custom Emoticon Metadata |
| id3 | ID3 Metadata |
| id3 | iData v3 Database |
| id31 | Helium Music Manager id3 Tags Export |
| id3tag | MP3 Skype Recorder Temporary Data |
| idat | Illumina BeadArray Data |
| idata | iData v2 Database |
| idb | IDA Database |
| idb | InfoStat Database |
| idb | Intuit Quicken Home Inventory Data File |
| idb | PocoMail Index |
| idb2 | InfoStat Database 2 |
| idb2 | Q-MIDI Instrument Database |
| idc | Lotus Notes Certificate Data |
| idcl | Autodesk Inventor Content Library |
| ide | Sophos Anti-Virus Virus Identity Data |
| ide-shm | SQLite 3 Database Shared Memory |
| ide-wal | SQLite 3 Database Write-Ahead Log |
| identifier | Microsoft Windows Zone Identifier Data |
| idf | Autodesk Inventor Intermediate Data Format |
| idf | Autodesk Land Desktop Intensity Duration Frequency Data |
| idf | CircuitWorks Intermediate Data |
| idf | InspireData Data |
| idf | Intermediate Data Exchange File |
| idif | Netscape Navigator Addressbook Identification Data |
| idj | IDATG Java GUI Info File |
| idl | CRiSP Harvest Inter-Dam Loss Data |
| idm | iData Mobile Data |
| idm | Ulead PhotoExpress Message Data |
| idmef | SNORT IDMEF Data |
| idms | Adobe InDesign Snippet |
| idoc | SAP IDoc File |
| idos | Plaque Simulator Custom Isodose Data |
| idpp | Adobe InDesign Preflight Profile |
| idrc | Adobe InDesign Resource |
| idrm | Tekla ID Mapping File |
| idroo | IDroo Data |
| idsp | eXtendable Wad Editor IDSP Data |
| idt | Cimplicity HMI IDT Data |
| idu | Interleaf Desktop Utility |
| idvi | eXtendable Wad Editor IDVI Data |
| idx | Canon ZoomBrowser EX Database Index |
| idx | Citrix Program Neighborhood Database Index |
| idx | dBASE Database Index |
| idx | Easy Timesheets Index Data |
| idx | Galactic IDX Library |
| idx | Intuit Quicken Index Data |
| idx | LaTeX Unsorted Index Data |
| idx | Microsoft Outlook Express Mailbox Index |
| idx | Microsoft SQL Server Constraints |
| idx | PTC Creo Instance Index Data |
| idx | SmartWare Index Data |
| idx | Sunnysoft InterWrite Index Data |
| idx | Treepad Database Index |
| idz | Autodesk Inventor Compressed Content Library |
| idz | I-DEAS Data |
| ie | MyEclipse Image |
| ied | ISIS Event Data File |
| ief | iCE CFR Raw Data |
| ief | ISIS Control File |
| iei | Image Eye Index Cache |
| iel | ParticleIllusion SE Emitter Library |
| iem | Informix Error Message |
| ienv | iData 3 Envelope Template Data |
| ies | IESNA Photometric Data |
| ie_ | Compressed IEC File |
| if90 | Programmer's Notepad Data |
| ifaith | iFaith SHSH Data |
| ifc | Industry Foundation Classes Data |
| ifczip | Compressed IFC Data |
| ifd | Adobe Output Designer Form |
| iff | SmartWare Temporary Merge Data |
| ifi | inFlow Inventory Database Backup |
| ifiction | Zoom iFiction File |
| ifl | Autodesk 3D Studio Max Image File List |
| iflv | InfoLevin Database |
| ifm | Brighterion iPrevent Fraud Model |
| ifm | RSView Machine Edition Information Message |
| ifm | Shana Informed Filler Form Data |
| ifn | IGOR Pro Formatted Notebook File |
| ifo | ImageForge Pro Graphic Object Layer Data |
| ifo | RSView Machine Edition Information Setup Data |
| ifol | Instant File Opener Data |
| ifp | KnowledgeMan Script |
| ifs | Ant Movie Catalog Script |
| ifs | FractInt IFS File |
| ifs | InfoSlips Package |
| ifs | OS/2 Warp Installable Filesystem Data |
| ift | BSL Inverse Fourier Transform Data |
| ift | IGOR Pro Formatted Notebook Template File |
| ifw | INTUS Terminal Firmware |
| ig | iSpy Event Data |
| igb | Google Earth Model File |
| igc | Anime List Builder Data |
| igd | TIBCO Spotfire Graph Definition |
| igl | inSORS Grid Layout File |
| igm | Indigo Material Data |
| igm | IOCOM Visimeet Data |
| igma | INTUS Terminal Graph Mask Archive |
| ign | Adobe RoboHelp Ignore List |
| ign | ICQ Ignore List |
| igq | Indigo Queue Data |
| igr | Igor Engraver Data |
| igs | Indigo Renderer Scene |
| igt | ImageGadget Template |
| igtheme | ImageGlass Theme |
| igtx | IGOR Pro Text |
| igv | Integrative Genomics Viewer Data |
| igw | Interactive Groundwater Modeling Data |
| iha | Proficy Historian Archive |
| ihand | iClone Hand Data |
| ihc | Proficy Historian Configuration |
| ihs | Bink Inbound History Data |
| ihw | IN-HEH Timeline Workspace |
| ihx | IN-HEH Timeline Database |
| ii | IconWorkshop Extended Information |
| iib | Lotus Notes Incremental Backup Data |
| iic | ISIS Initial Conditions Data |
| iid | Instantiated IED Description Data |
| iie | SimSystem IIe Emulator Data |
| iif | Shana Informed Filler Interchange Document |
| iii | Know Your Stuff File |
| iil | Norton CleanSweep Installation Log |
| iio | CoreFSIF IO Stream Data |
| iis | Panasonic Camcorder IIS Metadata |
| iix | SDL Trados Translation Memory Index |
| ijf | IDIS Job Data |
| ijg | Independent JPEG Group Related Data |
| ike | IKE-Scan Data |
| iklax | AirParrot Media Data |
| ikn | IKinema Rig Data |
| il3 | ParticleIllusion 3 Library |
| ilabel | iData 3 Template Label Data |
| ilda | ILDA Frames |
| ileaf | Interleaf Desktop |
| ilf | Alim Data File |
| ilg | LaTeX Index Generation Log |
| ilg | LinkOne Internal Data |
| ilg | MakeIndex Error Log |
| ilht | Mac OS X Finder Internet HTTP Location |
| ilib | ClarisDraw Art Library |
| ilight | iClone Light Data |
