Hello

I have a persistant Knoppix fileset [of 2 files] on my memory stick one of which is called:
configs.tbz

I want to decompress it, make a modification and then recompress it to the same format.
I can decompress it using Konqueror's drop down menu to give to 2 folders:
home and etc

but when I use Konqueror's drop down menu to recompress it, it does not offer:
.tbz

only:
tar.bz2

How can the 2 folders be compressed to:
.tbz

please?