Sandee, I'm not sure this will be helpful, as I don't know what platform you're on, but my little experiment in CS6 on Windows XP indicates that the file last clicked in the Open dialog will be the first available when the range opens in InDesign. See my results:
7 files names A.indd through G.indd
File > Open > Click A / Shift-Click G - open order from last, (which is the first available for editing) to first, (which is the last in the cascade): GABCDEF
File > Open > Click G / Shift-Click A - open order from last to first: ABCDEFG (this is the result you want, I think)
File > Open > Click [any] / Ctrl-Click Random Order - open order from last to first: Letter before [last-clicked] - alpha-order - [last clicked]
Example: File > Open > Click D / Ctrl-Click F, A, B, G, E, C - open order from last to first: CDEFGAB
I'm on OS X Lion, and created the same files as John (mine were named: A.indd, B.indd...) and no matter which order I selected--whether from A.indd to G.indd or G.indd to A.indd--my files alway opened with "G" being the topmost, in descending order. This indicates to me that it is a system hierarchy, and not InDesign-dependent. I'm assuming it's opening them alphabetically, regardless of the order in which they were selected. DARN! Maybe renaming them 'in reverse' would work...
Ah Ha! Found the answer. It is indeed a system situation, and the trick (on OS X Lion, at least) is to view your files/folders as "Date Created". This correctly brings them to open with "A" on top, then in descending order. Hope this helps!
Message was edited by: HeyMikey