| ileaf | Interleaf Desktop |
| ilf | Alim Data File |
| ilg | LaTeX Index Generation Log |
| ilr | Unity License Request File |
| ils | RFM Instrument Line Shape File |
| ilx | Interlex Vocabulary Data |
| im4p | IMG4 Payload Data |
| ima | Zemax Image Surface Data |
| imb | IncrediMail Address Book |
| imd | Integration Manager Database |
| ime | IncrediMail Emotions Data |
| imf | IncrediMail Letter File |
| img | Magellan eXplorist Map Image |
| img3 | Apple iPhone IMG3 Data |
| img4 | Apple iPhone IMG4 Data |
| imi | Magellan eXplorist Map Image |
| imiss | PLINK Individual-based Missing Data Report |
| imk | IncrediMail License Key |
| imn | IncrediMail Notifier |
| imw | IncrediMail Sound File |
| in4 | InfoBlaster IN4 Data |
| inb | Delft3D Initial Bed Composition Data |
| inc | POV-Ray Include File |
| ind | LaTeX Processed Index Data |
| ind | SQL Script Indexes |
| ind | TINA Library Index |
| ind | Maple Repository Index File |
| index | DICT Index File |
| index | MySQL Binlog Index File |
| indk | Adobe InDesign Keyboard Shortcut Set |
| inds | Adobe InDesign Snippet |
| indx | CALDB Index |
| info | Spider File Storage Index |
| inf_loc | Windows Driver Information Cache File |
| ing | MasterCook Ingredients Data |
