Thanks for the notice, David. I have downloaded and unzipped the file. Bang on, the comic pages are bmp images with the covers as jpeg images. However the .cbz file opens perfectly using CDisplayEX and the older Sequential Image Display programme. So if you are using comical, it definitely wont work. Try downloading CDisplayEX and see if you can get it then, please.
http://www.cdisplayex.com/downloadsAs I'm not sure how to convert bmp to jpeg, some of the big brains on CB+ - and I use that term loosely - will have to do it, so it might take some time to fix. Sorry.