A .CB7 file is shorthand for "comic book, 7z-compressed", containing page images and optional metadata arranged in filename order so readers can present them like a book; CB7 exists for convenience, though support varies across devices, and converting to CBZ by extracting then re-zipping usually improves compatibility, with the archive itself opening like a standard 7z that should contain only images.

The "reading order" point matters because an archive cannot inherently tell which page is first—your comic reader sorts by filename—so using zero-padding (`001`, `002`, `010`) avoids the issue where alphabetic sorting puts `10` ahead of `2`; ultimately a CB7 is just a normal 7z archive full of page images renamed to `.cb7`, which simplifies sharing, prevents shuffling or renaming mishaps, and lets comic apps display pages smoothly, maintain reading position, show double-page spreads, handle metadata like `ComicInfo.xml`, and keep everything neatly bundled with slight compression benefits.

Inside a .CB7 file you usually encounter a simple image-based comic layout, padded for proper sorting and sometimes organized into chapters, along with optional cover art and metadata like `ComicInfo.xml`, plus minor OS artifacts, while suspicious non-image items merit caution; reading is done in comic apps that sort pages automatically, or by extracting it as a 7z archive using standard tools.

A quick way to check whether a .CB7 file is legitimate is by opening it with 7-Zip and confirming it contains page images in sequence, often with a `cover.jpg` and optional `ComicInfo.xml`; any presence of `.exe`, `.cmd`, `.vbs`, `.js`, or similarly suspicious non-image files indicates danger, and page files typically appear similar in size, while extraction errors from 7-Zip usually mean the archive is corrupted or not a proper comic.