CBR is a common file format used to store the pages of digital versions of comic books. When opened with a utility like CDisplay, you can flip through the pages of a CBR file on your computer the same way you would if you were physically holding an actual comic book. If you want to extract the image files contained in a CBR archive, you'll need to use a program called WinRAR.
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Download and install WinRAR, if you haven't already (see Resources). WinRAR is the official program of the RAR archive format. WinRAR is available in a free 30-day trial from the program's official website.
Right-click on your CBR file. Click "Rename."
Change the ".cbr" part of the file's name to read ".rar". This will turn the CBR archive into a regular RAR archive.
Right-click on your RAR archive. Click "Extract" to extract all of the images from the RAR archive into a folder on your desktop.