: Successfully open documents in versions as old as InDesign CS4.
IDML (InDesign Markup Language) is Adobe’s for InDesign files. Unlike INDD files, IDML can be opened by any version of InDesign (CS4 and later). It is also the standard format for: online converter indd to idml
The reason for this scarcity lies in the complexity of the file structure. : Successfully open documents in versions as old