| in4 | InfoBlaster IN4 Data |
| in7 | OxMetrics Human-readable Data |
| ina | MS-DOS Data |
| inb | Delft3D Initial Bed Composition Data |
| inc | Altair FEKO PREFEKO Include Data |
| inc | JAWS Include Data |
| inc | Microsoft Backup Incremental Backup Data |
| inc | POV-Ray Include File |
| inc | Total Commander Language Data |
| inchi | IUPAC International Chemical Identifier Data |
| incl | BBEdit Markup Include |
| ind | LaTeX Processed Index Data |
| ind | Lotus Notes List Data |
| ind | Maple Repository Index File |
| ind | SQL Script Indexes |
| ind | TINA Library Index |
| ind | Zemax Input Data |
| indbc | Alteryx Designer Packaged In-DB Connections Data |
| index | DICT Index File |
| index | MySQL Binlog Index File |
| index | WOW! Diagnostic Index Data |
| indexarrays | Mac OS X Spotlight Index Data |
| indk | Adobe InDesign Keyboard Shortcut Set |
| inds | Adobe InDesign Snippet |
| indx | CALDB Index |
| indx | Microsoft Mail Index Data |
| inetloc | Mac OS X Finder Internet Location |
| inf | PTC Creo Information Data |
| inf | Ulead Photo Explorer Thumbnail Info |
| infini-d | Infini-D 3.0 Scene |
