IDML is a universal InDesign exchange format. It opens in InDesign CS4 and newer .
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Lucas’s first instinct was panic. He tried "File > Export," looking for an option that said "Save as InDesign 2020." It wasn't there. He tried "File > Save As," hoping to change the file extension manually. No luck. Adobe locks the .indd format tightly. IDML is a universal InDesign exchange format