What about a hybrid between @Alan-Kilborn & @mere-human earlier selection?
(please excuse the ugly artwork example:
idea.jpg
additions/changes/tweaks:
“new 9” updates to the next file for each single press of ‘Yes’ or ‘No’
‘Yes’ saves the file in question, ‘No’ doesn’t and both skip to the next file
‘N’ counts down as Yes or No are pressed
add a balloon hint to ‘Yes to all’ to show the ‘Can be changed in preferences’ hint.
The part I’m not sure about is: What to do when the list of N+1 files has been presented and there are still unsaved files. My first thought is that’s the job of the ‘Close’ dialog as the ‘Save All’ dialog has completed it’s job. My second thought is to ask for ideas.
BTW: I’d rather see ‘Yes to all’ be rewritten as ‘Yes, save all’