I noticed that in v. 15.1.2 an InDesign "book" file no longer has the .INDB extension, but is now an .INDD. If that is intentional, Adobe needs to update the User Guide at https://helpx.adobe.com/indesign/user-guide.html/indesign/using/creating-book-files.ug.html1 vote
The issue is not reproducible. InDesign Book has .indb extension.
- Don't see your idea?