This is in our backlog for Word, Excel, and PowerPoint: to be able to see PDF official versions in the open dialog so you can access version options to open a Word, Excel, or Powerpoint unofficial version.
We have made it in our new version (2.0, shipping soon) so that you can save as, see the PDF in the list, and version it with a new Word document.
You can also use the Activity center, which shows version specific information. If you right click on a document you can access the other versions that way. However, this only works for the last 100 documents the local PC / User has worked with.
Thanks for taking the time to tell us what you would like.