| idr | CompactDraw Project |
| if | IFWin Project File |
| iip | Install Creator Project |
| iit | Install Creator Project |
| ijp | Instant JChem Project |
| ikt | MagicMaps Tour Explorer Project |
| ilj | Honestech VHS to DVD Project |
| imovieproj | iMovie Project |
| imovieproject | iMovie Project |
| inform | Inform for Mac OS X Project |
| ip3 | ParticleIllusion 3 Project |
| ipj | Impatica OnCue Project |
| ipj | Autodesk Inventor Project |
| ipo | InstallShield Object Project |
| ipr | InstallShield Project |
| ipr | IntelliJ IDEA Project |
| iproject | iClone Project |
| iqp | ITEM QRAS Project |
| ircp | Adobe SpeedGrade Project |
| irp | Zylox Internet Researcher Project |
| irpz | iRidium Encrypted Project Archive |
| ism | InstallShield Setup Project |
| ispro | InstallSimple Project |
| isproj | InstallShield MSBuild Project |
| ivg | VisualAge RPG Project File |
| iwp | Website X5 Project |
| iwprj | Incomedia Website X5 Project |
| iwz | InstallShield Wizard Project |
| izz | Isadora Media Control Project |
| izzy | Isadora Media Control Project |
| jbp | Jabaco Project |
| jbp | DJ Jukebox Project |
| jcc | Code Crusader Project |
| jclic | JClic Project |
| jcp | JCreator Project |
