| 121. | .iv | 3D object (Open Inventor format) |
| 122. | .iv-vrml | Inventor VRML Format document |
| 123. | .ivb | Bitmap graphics (Truevision Targa format) |
| 124. | .ivd | Microdata dimension or variable-level file (Beyond 20/20) |
| 125. | .ivp | User subset profile (Beyond 20/20) |
| 126. | .ivr | Virtual reality world (live picture) |
| 127. | .ivt | Information title (InfoViewer) ◊ Table or aggregate data (Beyond 20/20) |
| 128. | .ivx | Microdata directory (Beyond 20/20) |
| 129. | .iw | Presentation flowchart (IconAuthor - HSC InterActive) ◊ Screensaver (Idlewild) |
| 130. | .iwa | Text document (IBM Writing Assistant) |
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