I'm using information from 'wiki.cheatengine.org/index.php?title=Lua:Class:SaveDialog' and didn't actually test this. By use I mean I've pretty much lifted the example and changed a couple of things to actually use the SaveClass.
local save_dialog = createSaveDialog(self)
save_dialog.InitalDir = os.getenv('%USERPROFILE%')
if save_dialog.execute() then
You'd replace the 'print' text with most of the bit that saves the image. ie:
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