I have a document I created in Pages on my old iMac in the year 2010, but cannot open it in current version of Pages ("document does not have a valid format").
I tried right clicking the document and opening as and tried opening it with preview. Didn't work.
The version of Pages I used to create the file came with my last mac which I bought in early 2009 (just before snow leopard came out). I don't have the computer any more.