Just to clarify something which I hadn't understod and I believe PhotoComiX also hasn't:
The program already includes 7zip to do some stuff, however, 7zip can't create CBR files; that's what you need winrar.exe for (which, presumably is the only one which does support the creation of CBR files?)
To clarify, it's the Rar.exe file that Comic Book Archive Creator will look for...not the WinRAR.exe file. However, you're correct in that 7-zip cannot create
RAR files. In fact, without a license, no third-party can create
RAR files. They can all unpack
RAR files because, as per the license, you can distribute and use the UnRAR components freely. In other words:
1) Creating RAR files means you must have a license.
2) Unpacking RAR files is free.
So, to reiterate, Comic Book Archive Creator includes everything you need to create CBZ, CB7, and CBT files. If you want to create CBR files, you will have to provide your own copy of the Rar.exe file.