Adobe InDesign is used to create and format pages like magazines, brochures, etc. They are saved as .INDD files after working. They can be opened in InDesign and work further or make changes to the ...
A file with the .ai extension is an Adobe Illustrator vector graphic file. Adobe Illustrator is a professional drawing and design application, and saves drawings in a vector graphic format with the ...
Though Photoshop doesn't directly open InDesign project files, the two programs are closely related. Both are part of Adobe's Creative Suite 6 package, so the programs share common file formats.