The .CBZ file is usually a CandyBarZ theme file. It is a plain text file with an structure using brackets.
Sample
;Theme File Generated by CandyBarZ ThemeBuilder
[INFO]
{
Name = "PillBox"
Author = "Cristiano Guadagnino <criguada@tin.it>"
Date = "29 Dec, 1999"
Version = "0.8"
}
[TITLEBAR]
PluginName = SZEIMAGE
{
....
<&PRE>
This CBZ files are located in the CandyBarZ installation directory and it includes a folder (usually with the same name) with the graphic components of the scheme.