In linux the extension are merly informative, in this case the .tar.bz states that the file is a tar (kind of package) and the bz that it's compressed.
The command 'file' may help you finding out the filetype
:~/Documents$ file Configs.tar.bz2
Configs.tar.bz2: bzip2 compressed data, block size = 900k
Now, to "use" the file you simply need to uncompress it, from the command line:
tar -xzf [filename.tar.bz]
This will create a new directory called [filename].
Enter this new directory and look for the README file, there you will find instructions to compile and install the package.
Normally you only have to execute ./configure -> Make -> Make-install.
Hope you find this useful