Systat Software Inc.
If you want to edit JNB file and not damage it, you should install dedicated software Using tools such as JNB Online Editors gives less editing possibilities than software adapted to work with the JNB file format.
The installation of the program that supports the JNB file does not guarantee that the file can be edited. Additional information about the JNB file extension can be found here.
This is the best way. Use any of the programs that support the JNB file to check if it allows you to edit the file. The most proven method is to download the installer from the developer's website. Links to the websites of software producers can be found on the software subpages. Below you will find some examples of software programs that support the JNB file (so it is very possible that they can edit files in JNB format).
And here is the full list of programs supporting the JNB file
Most of the file formats are simply text format saved under a different extension - so you can open them e.g. with Windows Notepad However, such manual editing of the JNB file or any other file may result in damage to the file. When you save the changes, you may no longer open the JNB file. For this reason, try to use software created to edit JNB files.
It can definitely be said that any of the list of programs that support the JNB extension should be able to edit the JNB file. Use other options if you still haven't found a way to edit JNB. Below we found websites that help in editing JNB files.
Free Online File Edit Service
Copy and paste this link anywhere.