BLUEJ file format description

Many people share .bluej files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .bluej file can be edited, converted or printed with. On this page, we try to provide assistance for handling .bluej files.

1 filename extension(s) found in our database.

.bluej - BlueJ Package

The BLUEJ development files are related to BlueJ. The BLUEJ file is a BlueJ Package. BlueJ is an integrated development environment (IDE) for the Java programming language, developed mainly for educational purposes, but also suitable for small-scale software development.

Application:

BlueJ

Category:

Development files

Mime-type:

application/octet-stream

Magic:

- / -

Aliases:

BlueJ Package related extensions:

.ctxt: BlueJ Context File
.defs: BlueJ Settings File
.tmpl: BlueJ Template File

Naturally, other applications may also use the .bluej file extension. Even harmful programs can create .bluej files. Be especially cautious with .bluej files coming from an unknown source!

Can't open a .bluej file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:

example.bluej

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 one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

Open Control Panel > Control Panel Home > Default Programs > Set Associations.
Select a file type in the list and click Change Program.

The .bluej file extension is often given incorrectly!

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

blue

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

.blue: EVE Online Generic Data File

Operating systems

DataTypes.net currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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

https://datatypes.net/open-bluej-files

If you have useful information about the .bluej file format, then write to us!