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Filename extension
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Informations about the J filename extension and the file formats associated with it

We collected the information you should know about the .j filename on this page. If you were sent a(n) .j file in an e-mail, but you don’t know what to do with it, then you can find help here. We strive to suggest free, open-source applications that are available to everyone for the file formats.

2 filename extension(s) are in our database

.java - Java Source Code

The JAVA file is a Development file, which is connected to the Java Source Code according to our registry. With the adequate settings, the Java Source Code (.java) files can be opened or converted with the help of Java Development Kit.

Format description:
JAVA format
Java Development Kit
Magic string:
- / -
j, jav
Related links:
Related extensions:
JAAS Configuration File
Java Source Code
Java Cryptography Extension KeyStore
Java Key Store
Pack200 Archive
Portable Heap Dump

.jpg - JPEG Bitmap Image

The JPG file is a Graphic file, which is connected to the JPEG Bitmap Image according to our registry. We currently can’t suggest an application for opening the JPEG Bitmap Image format.

Format description:
JPG format
Magic string:
0xff, 0xd8, 0xff / ÿØÿ
cmp, j, jff, jfi, jfif, jif, jpe, jpeg, jtf
Related links:
Adobe PhotoShop
Related extensions:
WildGame Innovations Digital Camera Photo
Buttonz and Tilez Texture
Advanced Image Coding
KISekae Set System Bitmap
RIPTerm Image
Optigraphics Image

Important! Programs other than the ones listed above may also use the .j file extension. Even harmful programs can create files with the .j extension to store data in them. Always be careful with .j files coming from unknown sources. Don’t open executable files that arrived in mails, even if you know the sender.

The .j file can’t be opened on your computer?

If the program necessary for opening the .j file is installed properly on your computer, then the quickest and simplest way to open the .j file is to double-click on the file’s name. If that doesn’t work, then the right software probably isn’t installed on your computer.

While opening the .j file, you may receive an error message from the associated application, this can be caused by the following:

Associated applications

The Windows operating system stores information about the applications associated to the file extensions in the registry database. The associations can be queried or modified in the Command Prompt window with the "assoc" command.

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We gladly accept application suggestions, but our primary goal is to suggest reliable, open-source applications that can be freely distributed to the users.

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