Если знаете букву, на которую начинается нужное расширение - выберите ее.

.INDB расширение

Расширение формат файла «.indb»
Тип файла Adobe InDesign Book File
Разработчик Adobe Systems
Категория Файлы разметки документа

Описание формата файла

Book file created by Adobe InDesign, a professional page layout and publishing program; contains multiple .INDD documents, which comprise the pages and chapters of the book; also stores the page numbers, indexes, and other formatting information.

INDB files are used for compiling documents into a larger book, as well as publishing and printing the final copy. They are often helpful for saving computer resources while editing, since the computer does not have to load all of the INDD file contents while creating the book.

NOTE: Books can be accessed using the Book panel within InDesign. Books are separate from documents (INDD files), since one or more documents are used for populating the contents of the book.

Программы, которыми можно открыть файл .INDB