Reduce cbt file size

Download and install the latest version of Filestar.
Right click on one or more Cbt file(s) on your desktop and select Convert with Filestar.
Type reduce file size in the search box.
Press Run.

What is .cbt?

Name: Comic Book TAR File
Extension: .cbt
Format: Binary
Category: Ebook
Developer: TAR Software Inc.
Description: A CBT (Comic Book TAR) file is a file that contains a collection of comic book files in the TAR (Tape Archive) format. It is commonly used for storing and sharing large collections of comic books, and for distributing comics over the internet.
MIME Type: application/x-cbt
Sample: sample.cbt
Wikipedia: .cbt on Wikipedia