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JAR Compressed File
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Java Source Code (Sun)
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JPEG / JFIF Image
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EDIT Compiler JEDEC Boundary File
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Jazz Jackrabbit 2 Animation Library (Epic MegaGames Inc.)
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Jazz Jackrabbit 2 Music File (Epic MegaGames, Inc.)
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Jazz Jackrabbit Data File (Epic MegaGames, Inc.)
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Jazz Jackrabbit 2 Episode File (Epic MegaGames, Inc.)
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J2 Fax File
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Jazz Jackrabbit 2 High Scores (Epic MegaGames, Inc.)
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Jazz Jackrabbit 2 Internet Server Link (Epic MegaGames, Inc.)
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JPEG-2000 JP2 File
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Jaxx Creation Station Level File (Epic MegaGames Inc.)
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Jazz Jackrabbit 2 Recorded Macro (Epic MegaGames, Inc.)
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Jazz Jackrabbit 2 Language Data (Epic MegaGames, Inc.)
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Jazz Jackrabbit 2 Tile Set (Epic MegaGames, Inc.)
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Jazz Jackrabbit 2 Cinematic File (Epic MegaGames, Inc.)
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Ricoh Digital Camera File
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Ricoh Digital Camera File (Ricoh Co., Ltd.)
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Javelin Configuration File (Minisoft Inc.)
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IBM Tools Updater File
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Trainz Railroad Simulator Game Content (Auran Games)
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Jacksum Fingerprint (Dipl.-Inf. (FH) Johann N. Löfflmann)
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Java Application Descriptor File (Sun Microsystems, Inc.)
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Jaguar Server File
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E-mail
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FTN Software Jam Messagebase
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Image Microprose
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JamTracker Music Module
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Joaquim-Andrew-Mats Message Base Proposal
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Jammix Enhacer Music Transform File (Danilics Tibor)
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Fifa World Cup Game Data fe Art Legalscr File
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JAlbum Project File (Datadosen)
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JAR Archive (ARJ Software, Inc.)
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JARCS Compressed Archive (JPMdL Archival System)
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Java Applet (Sun)
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Java Archive (Sun Microsystems, Inc.)
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Paint Shop Pro Compressed Graphic (Corel Corporation)
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JAS Compressed Graphic
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Jauge
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Java Source Code (Sun)
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Java Source Code (Sun)
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IchiTaro Web Japanese Extended WordProcessor (Justsystem Corporation)
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JBIG2 Bitmap Graphic
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Jabaco Source Code Programming Language (Jabaco)
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JobEditor32 Binary Job Data (Motoman Inc.)
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BestCrypt Container (Jetico, Inc.)
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Jam Byte-Codec File
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SigmaScan Data File
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Backup Now Backed Up File (JetSoft Corporation)