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JJ file format description

JJ file format

We made this page to help you understand how to work with JJ files. Here, you can find info on software that can handle these files. It includes simple programs for opening and converting them.

Learn about the JJ file and its functions here!

We also explain how to convert them into other types. It's simple and hassle-free. For opening or changing JJ files, this page offers all the tools you need.

#1 JavaCC Data

The JJ file is categorized under Development. It is associated with JavaCC, serving as a JavaCC Data. JavaCC (Java Compiler Compiler) is an open source parser generator and lexical analyzer generator for the Java programming language. It seems that JavaCC is no longer supported by the maker.

Application:JavaCC
Category:Development files
Mime-type:application/octet-stream
Magic:- / -
Aliases:-

JavaCC Data related extensions

  • mod Xilinx ISE TRACE Stamp Data
  • msk Xilinx ISE BitGen Mask Data
  • abc LithTech 3D Game Model
  • f4 Fortran IV Source Code

#2 C64 Doodle Compressed Image

The JJ file is categorized under Graphic. It is associated with XnView, serving as a C64 Doodle Compressed Image. Doodle is a software package for the Commodore 64 computer that allows users to draw graphics. Visit the website of XnView for a detailed description of the JJ format.

Application:XnView
Category:Graphic files
Mime-type:application/octet-stream
Magic:- / -
Aliases:-

C64 Doodle Compressed Image related extensions

  • $s ZX Spectrum Hobetta Image
  • 2bp Pocket PC Bitmap Image
  • 2d Amapi Image
  • 411 Sony Mavica Picture

Did someone accidentally misspell the JJ filename?

The JJ filename extension may be misspelled. We compiled a list of similar file extensions to help you find errors.

Filename extensions similar to JJ:

Windows can't open your JJ file?

When you try to open a file by double-clicking it, Windows looks at the file's name to figure out what to do. If Windows doesn't know the file type, it'll ask you to choose an app to open this JJ file.

To set the JJ file association in Windows 11, you can follow these steps

  1. Open the Settings app by clicking on the Start menu and selecting the gear icon.
  2. In the Settings app, click on System and then select Apps from the left-hand side menu.
  3. Scroll down and click on the Default apps option.
  4. In the Default apps section, you will find various categories. They include Email, Web browser, and Music player.
  5. Locate the category that matches the file type you want to associate. For example, choose Photos for image files, or Video player for video files.
  6. Click on the current default app listed under the category. A list of available apps will appear.
  7. Choose the app you want to set as the default for that file type. If the app you want is not listed, click on More apps to see more options. Or, click on Look for an app in the Microsoft Store to search for apps.
  8. After selecting the app, it will become the default choice for opening files of that type.

It's worth mentioning that you don't always need to set JJ file association. Many apps can open files. They don't need a specific file association to be set.

Handle JJ files with care

Exercise caution when handling JJ files from unknown sources. Files from certain sources can threaten your computer's security. They might contain malware, viruses, or harmful software. To minimize risks, avoid downloading or opening unfamiliar JJ files. Use trusted antivirus software to scan files from unknown sources before opening.

If you find the information on this JJ page useful, please feel free to link to this page.

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