| 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 |
| 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 |
| ini | Google Picasa Album Info |
| 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 |
| inmr | iNMR Data |
| inms | Adobe InDesign Menu Set |
| inn | Lumion Thumbnail |
| inp | Abaqus/CAE Input Data |
| inp | CHARMM Input Data |
| inp | PTV VISSIM Network Data |
