| Extension | 描述 | 檔案格式 |
|---|
| i00 | DVD Shrink Seperation File | 磁碟映像檔 |
| i01 | Disk Image Split File | 磁碟映像檔 |
| i3d | Micrografix Simply 3D File | 3D Files |
| iaf | Outlook Account File | 設定檔 |
| iam | Autodesk Inventor Assembley File | 3D Files |
| ibd | Installer Dialog Resource File | Misc Files |
| ibp | Isobuster Image File | 磁碟映像檔 |
| ibq | Isobuster Managed Image File | 磁碟映像檔 |
| ibt | IBtracer File | 遊戲檔案 |
| ica | Citrix Independent Computer Architecture File | 設定檔 |
| icd | SafeDisc Encrypted Executable File | 加密檔案 |
| icf | Conexant ADSL Modem Configuration File | 設定檔 |
| icl | Icon Library File | Misc Files |
| icm | Image Colour Matching | 設定檔 |
| icns | Icon File | 系統檔案 |
| ico | Icon File Format | 圖檔 |
| ics | iCalendar Calendar File | 資料檔 |
| id | Lotus Notes User ID File | Misc Files |
| id2 | Windows Live Messenger Emoticon File | 資料檔 |
| idcl | Inventor Desktop Content File | 資料檔 |
| ide | Inventor iFeature File | 3D Files |
| idf | Instrument Definition File | 聲音檔案 |
| idlk | InDesign Lock File | 設定檔 |
| idn | Infrared Digital Negative File | 圖檔 |
| idx | Index File | 系統檔案 |
| iff | Interchange File Format File | 資料檔 |
| ifo | DVD Information File | 視頻檔案 |
| ifp | Knowledgeman Script File | Developer Files |
| ifx | Rational XDE File | Developer Files |
| igs | International Graphics Exchange Specification File | CAD Files |
| iif | Quickbooks Interchange File | 資料檔 |
| iks | InSeine Document File | Misc Files |
| ima | Floppy Disk Image File | 磁碟映像檔 |
| image | Disk Copy Image File | 磁碟映像檔 |
| img | Image File | 磁碟映像檔 |
| imp | Audition Convolution Reverb Effect File | 聲音檔案 |
| in | CFAST Input File | Misc Files |
| inc | Include Files | Developer Files |
| ind | Adobe InDesign Document File | Layout Files |
| indd | Adobe InDesign File Format | Desktop Publishing |
| index | Index File | Misc Files |
| inf | Setup Information File | 設定檔 |
| info | ZoomBrowser Index File | 圖檔 |
| ini | Windows Initialization File | 設定檔 |
| init | WebMoney Temporary Key File | Misc Files |
| inp | Abaqus/CAE Input File | CAD Files |
| ins | Inspiration File | 資料檔 |
| install | Installation Text File | 文字檔 |
| int | Borland Delphi Interface File | Developer Files |
| inx | InDesign Export File | Desktop Publishing |
| ion | Description File | 文字檔 |
| ip | IconPackager Icon Set File | 圖檔 |
| ipa | iPod/iPhone Application File | 執行檔 |
| ipd | BlackBerry Backup File | 備份檔案 |
| ips | Patched Game File | 遊戲檔案 |
| ipsw | IPod/IPad/IPhone Software File | 壓縮檔案 |
| ipt | Autodesk Inventor Part File | 3D Files |
| iri | IR Image File | 圖檔 |
| irp | InfraRecorder Project File | Misc Files |
| irx | Brewer Irradiation File | 資料檔 |
| isn | Installer Source Files | Misc Files |
| iso | Disk Image File | 磁碟映像檔 |
| iss | InstallShield Silent Response File | 設定檔 |
| isu | InstallShield Uninstaller Script File | 執行檔 |
| isz | ISO Zipped File | 磁碟映像檔 |
| itc2 | iTunes Album Data File | 圖檔 |
| itdb | iTunes Database File | 資料檔 |
| ithmb | iPhone/iPod Thumbnail File | 圖檔 |
| itl | Music Library File | 資料檔 |
| itr | Icy Tower Replay File | 遊戲檔案 |
| itx | ITX Form Template | 資料檔 |
| iwd | Call of Duty Game Data File | 遊戲檔案 |