List of filename extensions / J
This list contains common file name extensions that are used in some operating systems to differentiate between file formats . In other operating systems, file type identification is mainly carried out using the file header, and the MIME type is more important than the file name extension for e-mail attachments . Systems that use the latter two approaches usually ignore the extension completely.
| Filename extension | MIME type | Full name | Remarks, usage |
|---|---|---|---|
| .j2k |
|
JPEG 2000 | Wavelet compressed image files |
| .j62 |
|
Ricoh camera file | - |
| .jam | audio / x-jam | Java modules | Compressed file archive |
| .jar | application / java-archive | Java Archive | Compressed file archive |
| .jarx | JARX file | contains information about .jar files | |
| .Yes |
|
Graphic | Generic |
| .Java | text / plain, text / x-java-source | Source code | Java |
| .jbd |
|
Data file | SigmaScan |
| .jbf |
|
Image browser file | Paint Shop Pro |
| .jbx |
|
Project file | Project Scheduler 4.0 |
| .jef | Janome Embroidery Format | for controlling Janome embroidery machines | |
| .jff | image / jpeg, image / pjpeg | JPEG image | - |
| .jfif | image / jpeg, image / pjpeg | JPEG File Interchange Format | JPEG standard compressed image file |
| .jgw .jpegw |
image / jpeg, image / pjpeg | JPEG world file | ASCII file that contains the georeference to a JPEG file |
| .jif | image / jpeg, image / pjpeg | JPEG image file | - |
| .jisp |
|
Java Indexed Serialization Package | SIM |
| .jks |
|
Java Key Store | Keystore in proprietary Java format |
| .jmp |
|
Discovery chart-to-statistics | SAS JMP |
| .jn1 |
|
Jill of the Jungle data | Epic MegaGames |
| .jnb |
|
Workbook file | Sigma plot 5 |
| .jnilib |
|
JNI Library | Program library for Java ( JNI ) (Shared Object) under Mac OS X |
| .jnt |
|
Journal Viewer File | Microsoft Journal Viewer |
| .job |
|
Vector graphic | QuestVision |
| .jor |
|
journal | Microsoft SQL Server |
| .jou |
|
Journal backup | VAX Edt editor |
| .jou |
|
Journal backup | VAX Edt editor |
| .jp2 | image / jp2 | JPEG 2000 | Wavelet compressed image files |
| .jpc |
|
JPEG 2000 | Wavelet compressed image files |
| .jpe .jpeg .jpg |
image / jpeg, image / pjpeg | Joint Photographic Experts Group | Lossy compressed image files |
| .jpf |
|
JPEG 2000 file | Wavelet compressed image file |
| .jpm | image / jpm | JPEG 2000 file | Wavelet compressed image file |
| .jpx | image / jpx | JPEG 2000 file | Wavelet compressed image file |
| .jra | application / crystalclear | i-net Crystal-Clear Report Archive | i-net Crystal-Clear report archive |
| .jrl | StarMoney Journals (Windows) | ||
| .js | application / x-javascript | JavaScript code | - |
| .jsc |
|
Source code | JetAudio skin creation script file |
| .jsd |
|
Jet Suite document | eFAX |
| .jsk |
|
Skin file | JetAudio control surface file |
| .json | application / json | JavaScript Object Notation | Independent data exchange format in text form |
| .jsp |
|
JavaServer Page | dynamic HTML file for Java-based web servers |
| .jt |
|
Jupiter tessellation | 3D data format |
| .jtf |
|
Fax document | Hayes JT Fax |
| .jtk |
|
Java ToolKit file | Sun Microsystems |
| .jw |
|
JustWrite | JustWrite Text Document |
| .jwl |
|
JustWrite Library | JustWrite library |
| .jzz |
|
Spreadsheet | jazz |
Individual evidence
- ↑ Jarx - The JAR executer
- ↑ Java Development Guide for Mac OS X: Core Java APIs and the Java Runtime on Mac OS X (Engl.) , Accessed 11 May 2009, 13:00.