Filename Extensions
If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .jj

2 extension(s) and 0 alias(es) in our database

Below, you can find answers to the following questions:

  • What is the .jj file?
  • Which program can create the .jj file?
  • Where can you find a description of the .jj format?
  • What can convert .jj files to a different format?
  • Which MIME-type is associated with the .jj extension?
C64 Doodle Compressed Image .jj file icon

C64 Doodle Compressed Image

The JJ file is a C64 Doodle Compressed Image. Doodle is a software package for the Commodore 64 computer that allows users to draw graphics.
Detailed description not available
Category: Graphic files
Application: XnView
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
Artist 64 Image
CDU Paint Image
Draz Paint Bitmap
C64 Fun Painter 2 Image
C64 GunPaint Image
C64 Image System Multicolor Bitmap
C64 Picasso 64 Image
C64 Saracen Paint Image
Vidcom 64 Image
JavaCC Data .jj file icon

JavaCC Data

The JJ file is a JavaCC Data. JavaCC (Java Compiler Compiler) is an open source parser generator and lexical analyzer generator for the Java programming language.
Detailed description not available
Category: Development files
Application: JavaCC
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
JavaCC Grammar File

Other types of files may also use the .jj file extension. If you have helpful information about .jj extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

Habanero-Java Source Code
JHipster Source Code
Join-Calculus Interface Source Code
Jakarta Tomcat Server Configuration
jMusic Music Score
JU Source Code
Jython Script
MovieJack DVD Ripper File
MOLPHY Neighbor Joining Phylogeny Data

The .jj filename extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

mj (1), ju (1), jk (1), jh (1), nj (1), jy (1), jm (1), ji (1), hj (1)

Can't open a .jj file?

If you want to open a .jj file on your computer, you just need to have the appropriate program installed. If the .jj association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.jj

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2003/2008/2012/2016, Windows 7, Windows 8, Windows 10, Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, iOS, Android