List of All the File Extensions Formats and Types Starting With the Letter I
| File Extension | Description |
| .IA | Roland Garros tennis persons |
| .IA1 | Infinite Algebra 1 |
| .IAB | Automatic Backup image |
| .IAD | Symantec Patch Management |
| .IAI | Nova Logic item attributes info |
| .IAM | AutoDesk Inventor assembly |
| .IAN | Sterling Software COOL Business team model text |
| .IAP | Iguana Active Server active page script format |
| .IAX | IBM Image Access eXecutive bitmap |
| .ICA | BrainVoyager QX independent component analysis Citrix Independent Computer Architecture IBM Image Object Content Architecture (IOCA) graphics Identity Compass encrypted answers |
| .ICS | Calendar calendar files format (Microsoft Outlook, Apple iCal) Image cytometry IronCAD 3D CAD Sony IC Recorder sound SwiftView command |
| .ISO | CD/DVD/HD DVD/Blu-ray disc ISO binary image CALS ISO 8613 bitmap graphics Cimagraphi CAD InstallShield uninstall Sega CD game Sony Playstation game image |