JAR
Java ARchive (a compressed file for applets and related files)
JAS
Graphic (Generic)
JAVA
Source code (Java)
JBD
Datafile (SigmaScan)
JBF
Image browser file (Paint Shop Pro)
JBX
Project file (Project Scheduler 4.0)
JFF
JPEG image
JIF
JPEG image
JFIF
JPEG image
JMP
Discovery chart-to-statistics (SAS JMP)
JN1
Jill of the Jungle data (Epic MegaGames)
JOB
Vector graphics file created by conversion of a IMG file (QuestVision)
JOR
Journal (Microsoft SQL Server)
JOU
Journal backup (VAX Edt editor)
JPC
Graphic (Japan PIC)
JPE
JPEG image
JPEG
JPEG compressed bitmap
JPG
JPEG bitmap
JS
JavaScript source code
JSD
Jet Suite document (eFAX)
JSP
A HTML page containing a reference to a Java servlet
JTF
JPEG bitmap
JTF
Fax document (Hayes JT Fax)
JTF
Bitmap graphic (JPEG Tagged Interchange Format)
JTK
Java ToolKit file (Sun Microsystems)
JW
Text document (JustWrite)
JWL
Library (JustWrite)
JZZ
Spreadsheet (Jazz)
J62
Ricoh camera file