| ivs | Aircrack-ng Initialization Vector Data |
| ivt | Beyond 20/20 Multi-dimensional Table |
| ivt | Concordance Inverted Full Text Database |
| ivw | i-Vocab World Array |
| ivwd | IntelliVIEW Designer Data |
| ivwl | IntelliVIEW Designer Layout |
| ivwr | IntelliVIEW Offline Report Data |
| ivx | Beyond 20/20 Micro-data Extract File |
| ivy | Apache IVY Module Descriptor |
| iw | Chain Engineering Database |
| iw | IdleWild Screensaver File |
| iw2 | Information Workshop 2000 Data file |
| iw3 | InfoWeb 3 Page |
| iwc | Installwatch Database |
| iwcf | Incomedia Website X5 Cell Style |
| iwi | Ignite Image Optimiser Data |
| iwl | Incomedia WebSite X5 License Data |
| iwm | AimTech IconAuthor File |
| iwm | iWriteMusic Data |
| iwnew | Autonomy Interwoven iwdeploy Server Received File |
| iwold | Autonomy Interwoven iwdeploy Server Received File |
| iwp | InfinityQS eSPC Data |
| iws | Installwatch Scan Data |
| iwt | Sunnysoft InterWrite Skin |
| iwtmp | OpenDeploy Temporary Data |
| iwxdata | iWorx LabScribe Data |
| ix | dtSearch Desktop Index |
| ix | PaperPort Search Data |
| ix | Pidgin IM Data |
| ix1 | Rebel Chess Data |
| ix2 | Corel WordPerfect Address Book |
| ixbrl | Sage iXBRL Data |
| ixc | ArcVIEW Geocode Coverage Index |
| ixd | Shedworx Interchange Team Data |
| ixe | IndeXExploit Index Data |
