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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .J2K | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | PaintShop Pro | Corel |
| .JAR | Oracle Corporation | Compressed Files | Java Archive File | Corel WinZip 21 | Corel |
| .JAS | Open Source | 3D Image Files | Cheetah3D Model File | PaintShop Pro | Corel |
| .JASC | Corel | Graphic Files | JAS Compressed Graphic | PaintShop Pro | Corel |
| .JBF | Corel | Raster Image Files | Paint Shop Pro Browser Cache File | PaintShop Pro | Corel |
| .JBR | Corel | Raster Image Files | Paint Shop Pro Brushes File | PaintShop Pro | Corel |
| .JFI | Joint Photographic Experts Group | Raster Image Files | JPEG File Interchange Image | CorelDRAW Graphics Suite | Corel |
| .JGD | Corel | Data Files | Corel PaintShop Photo Pro Gradients File | PaintShop Pro | Corel |
| .JIF | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Corel Photo-Paint | Corel |
| .JMD | Corel | Settings Files | Corel PaintShop Pro Image Map Settings | PaintShop Pro | Corel |
| .JP2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Core Image File | CorelDRAW Graphics Suite | Corel |
| .JPEG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Corel Photo-Paint | Corel |
| .JPF | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | PaintShop Pro | Corel |
| .JPG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Corel Photo-Paint | Corel |
| .JPG2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | PaintShop Pro | Corel |
| .JPX | Embarcadero Technologies | Developer Files | JBuilder Project | PaintShop Pro | Corel |
| .JS | NetScape | Web Files | JavaScript File | Corel WordPerfect | Corel |
| .JSCRIPT | NetScape | Web Files | JavaScript File | Corel WordPerfect | Corel |
| .JSD | Jazer Solutions | Data Files | Jazer Data File | PaintShop Pro | Corel |
| .JTF | Various Developers | Raster Image Files | JPEG Tagged Interchange Format | CorelDRAW Graphics Suite | Corel |
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