| ial | Microsoft SharePoint List Activity Data |
| ias | Intermodulation Analysis System Data |
| iati | International Aid Transparency Initiative Data |
| iaw | ImageAMMO Wrapper |
| ib | Embarcadero InterBase Database |
| ibadr | IsoBuster Address Data |
| ibak | Password Safe Intermediate Backup Archive |
| ibc | Incredibar Toolbar Content |
| ibc | Microsoft Outlook InterConnect Bizcard Data |
| ibd | Symantec Patch Management Solution v7 Data |
| ibd | MySQL InnoDB Tablespace |
| ibe | IBECrypto Encrypted File |
| ibk | Treepad Database Index Backup |
| ibl | sIBL System Data |
| ibn | WinIQSIM Data |
| ibo | IB Objects Data |
| ibp | CLIC RAW Data |
| ibs | IBIS 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 |
| ibz | MySQL InnoDB Database Table Compressed Backup |
| ic | Sony Ericsson Icon Pack |
| ic0 | HSPICE Initial Conditions Data |
| ic4 | SADiE Interchange Data |
| ica | BrainVoyager QX Independent Component Analysis Data |
| icalevent | iCal Event Data |
| icaltodo | iCal To Do List |
