: Open the file in the version of InDesign used to create it (or a newer version), navigate to File > Export , and select InDesign Markup (IDML) from the format menu. Compatibility : IDML files are generally compatible with InDesign and later. Legacy Versions : For extremely old versions like , the file must first be opened in CS4 and then exported as InDesign Interchange (INX) Third-Party Solutions
Note: Upon opening, the software will create a new "Untitled" document. You should immediately and choose the standard .indd format to lock it into that older version. Important Considerations how to convert indesign file to older version
Even with IDML, things go wrong. Here is how to fix the top three conversion failures. : Open the file in the version of