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It's a CS5.5 file
The InDesign file seems had been created in CS3 (or it says when I click "command+I" keys" over the file.
This would indicate to me that the latest version of InDesing that you have installed is Version 5 (AKA CS3) CS5 is version 7, and CS5.5 is version 7.5. Your OS cannot tell you that the file was created in a later version than the last one you installed.
Thank you, Bob
So, as the song said: "The only way is up(grade), baby" :-)
Thank you, Peter
You are right: My version is 7.0.4.
Thanks for the explanation