| 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 |
| jdp | BlackBerry JDE Application Project |
| jdv | JDEVS Project |
| jed | JED Editor Project File |
| jep | jEPlus Project |
| jex | JExpress Project |
| jlg | JoomLeague Project |
| jms | Hot Potatoes Masher Project |
| jpr | JBuilder Project |
| jpx | JBuilder Project |
| jpx | Borland Together Implementation Project |
| jsl | Visual J# Project |
| jude | JUDE Project |
| jvsg | JVSG Video Surveillance Project |
| k3b | K3b Disk Burning Project |
| kaw | Karma Authoring Tool Workspace |
