I'm not so sure that's really the correct answer. I don't recognize that icon, but I'm a Windows user so I suspect that's the Mac version of an icon, and on Mac the same icon is used for all files, regardless of the version from which they were saved. Furthermore, at least on Windows, the CS5 and CS5.5 icons are identical in coloring. There is a script at Adobe Forums: [Ann] Identify Your InDesign File that you can run to find the version.
Sorry, that answer is terrible wrong. With the splash screen, you see the information on the current version of InDesign. But there is a correct way to learn about the history of a file, when and where it was created, versions of program and OS:
On the Mac:
- Hold down the Command Key and go to the menu: InDesign > About InDesign…
- Hold down the CTRL Key and go to the menu: Help > About InDesign…
This will inform you on everything that happened with the file since the beginning or at least since the last IDML or INX clean up.tht
if karenb75959543 wrote that his computer died how can he do your instructions?
You can open this file later on a trial version, which can be installed anyway and check, which version was used to create that file and to save this file the last time.
The icon doesn't give you any information on that file, only of the currently installed version and this could also be wrong wired.
if karenb75959543 remembers more or less the splash screen (not icon), well we can give him the first and quickly information about which version of indesign could be.
Than naturally he could asked in-depth information and/or explain better his issue