Adobe InDesign document
INDD is a file extension for a page layout file used by Adobe InDesign, can also be opened using Adobe InCopy. INDD stands for INDesign Document. Contains formatting, content, styles, and linked files. Used for Desktop Publishing to create books, magazines, newpapers, flyers, etc.
MIME type: application/octet-stream
Learn more about .INDD files:
Visit the Adobe Indesign web page.
See answers to InDesign-related questions at ITKnowledgeExchange.com.