| ia64 | HP-UX IA64 Data |
| iab | Iomega Automatic Backup Data |
| iab | DB/TextWorks Image Annotation List Backup |
| 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 | 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 |
| ibank | iBank Accounting Data |
| ibc | Microsoft Outlook InterConnect Bizcard Data |
| ibc | PLINK GCTA Inbreeding Coefficient Report Data |
| ibc | Incredibar Toolbar Content |
| 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 |