| 91. | .io | Compressed file archive (CPIO) ◊ Object file (Modula-3) |
| 92. | .iob | 3d graphics database in TDDD format |
| 93. | .ioc | Organizational chart (Instant ORGcharting!) |
| 94. | .ioca | Bitmap graphics (Image Object Content Architecture) |
| 95. | .iof | Findit document (Microsoft Findit) |
| 96. | .ion | File descriptions (4DOS descript.ion file) ◊ Plain text (ASCII Mascot data file) |
| 97. | .ip | Data (Interactive Physics) ◊ Inspection Procedures (NRC Inspection Manual) |
| 98. | .ipl | Pantone Spot reference palette file (CorelDraw) |
| 99. | .ips | IPScript (IPIX) ◊ International patching system binary patch file |
| 100. | .iptc | Newswire profile |
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