| ivy | Apache IVY Module Descriptor |
| iw | Chain Engineering Database |
| iw | IdleWild Screensaver File |
| iw2 | Information Workshop 2000 Data file |
| iwc | Installwatch Database |
| iwcf | Incomedia Website X5 Cell Style |
| 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 |
| ixd | Videoalive Indexer Extracted Closed Captions Data |
| ixe | IndeXExploit Index Data |
| ixf | Integration Exchange Format File |
| ixl | DB/TextWorks Database Indexed List |
| ixo | LightCycler v4 Experiment Data |
| ixr | XL Reporter Template |
