The CB7 file format combines 7-Zip’s compression with comic book organization. CB7 uses the LZMA algorithm for high compression. A CB7 file contains comic book pages as image files like JPG. Software reads CB7 files to display pages as a comic book.
If your system does not open CB7 files, install a program supporting them. Right-click the file and select “Open with”. Choose the program and check “Always use this program”.
A CB7 file may not open because no program is associated with it. Install software supporting the format. If a program is installed, it is not the default. Associate CB7 files with the program in Windows.
Other issues blocking CB7 files: file corruption, missing Windows registry entry, incomplete installation, malware infection, insufficient hardware resources, outdated drivers.