For those of you interested in a deeper view into the program, there is a technical description that contains detailed information about the way C.a.R. was realized.
The file format of C.a.R. is based on XML. I have a written a not quite up-to-date description of this format.
C.a.R can export graphics in various formats. Besides the common bitmap graphics, it can export in the SVG and in the FIG format. Refer to the descriptions for more details.