| I | Visual Studio Intermediate File | Developer Files | 2 | 2 |
| I-E | Unknown File Type | Uncommon Files | 1 | 1 |
| I0 | Winter Windows Scheduler File |
Uncommon Files
| 1 | 1 |
| I00 | DVD Shrink Part 1 File | Disk Image Files | 2 | 1 |
| I01 | DVD Shrink Part 2 File |
Disk Image Files
| 1 | 1 |
| I02 | DVD Shrink Part 3 File |
Disk Image Files
| 3 | 1 |
| I03 | Split Disk Image File |
Disk Image Files
| 2 | 1 |
| I04 | Split Disk Image File |
Disk Image Files
| 2 | 1 |
| I05 | Split Disk Image File |
Disk Image Files
| 2 | 1 |
| I18 | Pixel Power Collage | Raster Image Files | 1 | 1 |
| I3 | Modula-3 Interface Source Code |
Developer Files
| 1 | 1 |
| I32 | NI LabView Data | Data Files | 1 | 1 |
| I3A | Point Blank Game Data File | Game Files | 2 | 1 |
| I3ANIMPACK | Point Blank Game Data File |
Game Files
| 2 | 1 |
| I3C | IBM Voice Type Languages Newuser File |
Data Files
| 1 | 1 |
| I3CHR | Point Blank Game Audio Data |
Game Files
| 1 | 1 |
| I3D | Houdini Image 3D File |
Raster Image Files
| 1 | 1 |
| I3EXEC | Point Blank Game Data File |
Game Files
| 2 | 1 |
| I3F | I3 Fax File |
Data Files
| 1 | 1 |
| I3I | IBM Voice Type Languages New User File |
Uncommon Files
| 1 | 1 |
| I3ML | I3ML Source Page |
Uncommon Files
| 1 | 1 |
| I3PACK | Point Blank Game Data File |
Game Files
| 2 | 1 |
| I3S | Point Blank Game Data File |
Game Files
| 2 | 1 |
| I66 | Unknown File Type |
Uncommon Files
| 1 | 1 |
| I8T | Unknown File Type |
Uncommon Files
| 1 | 1 |
| IA | Internet Archive | Web Files | 1 | 1 |
| IA6 | IApproach Data File |
Data Files
| 1 | 1 |
| IAC | Unknown File Type |
Uncommon Files
| 1 | 1 |
| IAD | Symantec Patch Management Data |
Data Files
| 1 | 1 |
| IAE | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| IAF | Outlook Internet Account File | Settings Files | 1 | 1 |
| IAM | Inventor Assembly File | CAD Files | 3 | 1 |
| IAO | ImperiumAO Game Data |
Game Files
| 1 | 1 |
| IAP | Infinity Engine Add-on Patcher File |
Developer Files
| 3 | 1 |
| IAR | CD Katalog Data |
Data Files
| 1 | 1 |
| IAS | BitDefender Data File | Database Files | 2 | 2 |
| IAT | iAuditor Template |
Data Files
| 1 | 1 |
| IBA | Lectra Clothing Design Pieces File |
CAD Files
| 3 | 2 |
| IBC | IncrediBar Cursor File |
Uncommon Files
| 1 | 1 |
| IBD | MySQL InnoDB Database Table |
Database Files
| 3 | 2 |
| IBF | Final Fantasy XI Game Data |
Game Files
| 2 | 2 |
| IBG | ImgBurn Graph File |
Data Files
| 2 | 1 |
| IBJ | Unknown File Type |
Uncommon Files
| 1 | 1 |
| IBK | IncrediMail Account Backup File | Backup Files | 1 | 1 |
| IBL | sIBL System Data |
Data Files
| 3 | 3 |
| IBM | Commodore Amiga Graphics Data | Graphic Files | 2 | 2 |
| IBOOKS | Multi-Touch iBook | eBook Files | 2 | 1 |
| IBP | IsoBuster Managed Image Information File |
Disk Image Files
| 1 | 1 |
| IBQ | IsoBuster Managed Image File |
Disk Image Files
| 1 | 1 |
| IBS | I2 iBase Data File |
Data Files
| 2 | 2 |
| IBT | Texture And Model File |
Game Files
| 2 | 2 |
| IBW | IGOR Pro Binary Wave Data |
Data Files
| 1 | 1 |
| IBX | Interscope BlackBox Data |
Data Files
| 1 | 1 |
| IBY | Symbian ROM Image Component Include File |
Uncommon Files
| 1 | 1 |
| IC | Modula-3 M3CG Intermediate Language File |
Uncommon Files
| 5 | 3 |
| IC1 | Low Resolution Imagic Graphics File |
Raster Image Files
| 1 | 1 |
| IC2 | Medium Resolution Imagic Graphics File |
Raster Image Files
| 1 | 1 |
| IC3 | High Resolution Imagic Graphics File |
Raster Image Files
| 1 | 1 |
| ICA | Citrix Independent Computing Architecture File |
Settings Files
| 1 | 1 |
| ICAL | iCalendar File |
Uncommon Files
| 4 | 1 |
| ICALENDAR | iCalendar File |
Uncommon Files
| 4 | 1 |
| ICB | Targa ICB Bitmap Image |
Raster Image Files
| 4 | 1 |
| ICC | International Color Consortium Profile File |
Settings Files
| 5 | 3 |
| ICD | SafeDisc Encrypted Program | Executable Files | 6 | 6 |
| ICE | ICE File Archive | Compressed Files | 3 | 2 |
| ICF | Zoom Router Configuration File |
Backup Files
| 10 | 1 |
| ICG | Image Comparer Gallery File |
Data Files
| 1 | 1 |
| ICL | Windows Icon Library File | System Files | 3 | 1 |
| ICM | Image Color Matching Profile |
Settings Files
| 1 | 1 |
| ICMS | RagTime Extensions File |
Data Files
| 1 | 1 |
| ICN | Windows Icon File |
Raster Image Files
| 6 | 5 |
| ICO | Icon File |
System Files
| 15 | 1 |
| ICON | Icon Image File |
Raster Image Files
| 4 | 1 |
| ICP | Unix IContact Parameter Data |
Settings Files
| 2 | 2 |
| ICPR | IconUtils Project File |
Raster Image Files
| 2 | 1 |
| ICQ | ICQ Archive |
Data Files
| 1 | 1 |
| ICR | Image Comparer Result File |
Data Files
| 1 | 1 |
| ICS | IronCAD 3D CAD Drawing File |
CAD Files
| 11 | 5 |
| ICW | Microsoft Internet Explorer Internet Connection Wizard Data |
Settings Files
| 2 | 2 |
| ICX | Remote Call Profiler Summary View |
Data Files
| 1 | 1 |
| ID | Lotus Notes User ID File |
Uncommon Files
| 3 | 2 |
| IDA | Microsoft IIS Server Data |
Data Files
| 1 | 1 |
| IDAPI | Borland Database Engine IDAPI Data |
Developer Files
| 1 | 1 |
| IDB | Visual Studio Intermediate Debug File |
Developer Files
| 2 | 2 |
| IDC | Core Software Tech IDC File |
Uncommon Files
| 4 | 3 |
| IDD | Adobe InDesign For Mac Document | Page Layout Files | 3 | 2 |
| IDE | GTA Item Definition File |
Game Files
| 3 | 2 |
| IDEA | Adobe Ideas Document | Vector Image Files | 2 | 2 |
| IDEAS | An Unknown Apple II File |
Uncommon Files
| 1 | 1 |
| IDEMO | InstantDemo Project File |
Data Files
| 1 | 1 |
| IDENTIFIE | Unknown File Type |
Uncommon Files
| 1 | 1 |
| IDENTIFIER | Windows Zone Identifier File |
System Files
| 1 | 1 |
| IDF | MIDI Instrument Definition File |
Settings Files
| 2 | 1 |
| IDI | EVA Controller Event Log |
System Files
| 3 | 3 |
| IDK | Interface Development Kit Data |
Data Files
| 1 | 1 |
| IDL | Interface Definition Language File |
Developer Files
| 1 | 1 |
| IDLK | Adobe InDesign Lock File |
Uncommon Files
| 1 | 1 |
| IDM | Ulead Photo Express Messages File |
Data Files
| 3 | 3 |
| IDML | Adobe InDesign Markup Language File |
Page Layout Files
| 2 | 1 |
| IDQ | Microsoft Internet Explorer Data Query File |
Data Files
| 2 | 2 |
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