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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .JAM | Sierra Entertainment | Audio Files | Leisure Suit Larry Magna Cum Laude Archive File | Leisure Suit Larry: Magna Cum Laude | Sierra Entertainment |
| .JCB | Jason C. Brooke | Audio Files | CB-JCBrooke Song/Module | Unknown Software | Unknown Developer |
| .JCP | Xinox Software | Audio Files | JCreator Project File | JCreator | Xinox Software |
| .JDF | Adobe Systems Incorporated | Audio Files | Adobe Acrobat Job Definition File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .JSPF | Oracle Corporation | Audio Files | Java Server Page Fragment | Adobe Dreamweaver | Adobe Systems Incorporated |
| .JWL | Roxio | Audio Files | Roxio Jewel Case File | Roxio Creator NXT Pro 5 | Roxio |
| .JXT | Interstellar Reasearch | Audio Files | Daqarta Extended Audio Data | Daqarta | Interstellar Reasearch |
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