| imw | IncrediMail Sound File |
| in2d | Netgen 2D Geometry Data |
| 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 | POV-Ray Include File |
| inchi | IUPAC International Chemical Identifier Data |
| incl | BBEdit Markup Include |
| ind | LaTeX Processed Index 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 |
| indk | Adobe InDesign Keyboard Shortcut Set |
| inds | Adobe InDesign Snippet |
| indx | CALDB Index |
| inetloc | Mac OS X Finder Internet Location |
| inf | PTC Creo Information Data |
| infini-d | Infini-D 3.0 Scene |
| info | Spider File Storage Index |
| info | ZoomBrowser EX Image Index Data |
| inf_loc | Windows Driver Information Cache File |
| ing | MasterCook Ingredients Data |
| init | WebMoney Keeper CLASSIC Temporary Keys Data |
| inj | DAZ Studio 3D Morph Injection Data |
| injb | Adobe InDesign Job Bag Data |
| ink | Tablet PC Digital Ink |
| inl | Inspiration Custom Symbol Library |
| inline | Base64 Encoded Inline Image |
| inlx | Adobe InDesign Interchange Library |
