I created a brochure using a free trial of InDesign CS8. I then saved it as an IDML file so that I can open it on my supervisor's computer, which has CS6. Is there a way to save the IDML file as a .indd file using CS6 so that I can open and edit a single document instead of editing and saving copies of IDML files?
The IDML file should open as an Untitled Document in any version of InDesign from CS4 forward. You need to use Save As and save as a new .indd file.