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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .JASC | Corel | Graphic Files | JAS Compressed Graphic | PaintShop Pro | Corel |
| .JFF | Freedom Scientific | Graphic Files | JAWS INI Data | JAWS | Freedom Scientific |
| .JJ | Pierre-Emmanuel Gougelet | Graphic Files | Doodle C64 Compressed Image Format | XnView MP | XnSoft |
| .JPK | JPK Instruments | Graphic Files | JPK Instruments File Format | Unknown Software | Unknown Developer |
| .JPM | Irfan Skiljan | Graphic Files | JPEG 2000 Multi-layer Image Format (ISO 15444-6) | IrfanView | Open Source |
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