Hi Wim, the startup folder is in the appdata location, not inside the app itself. On Mac this is under your user folder, in Library/Application Support/Moi but note that by default Apple hides the Library folder in Finder.

From a Terminal prompt type:

open ~/Library/Application\ Support/Moi

or in Finder from the Go menu choose Go > Go to folder, and put in:

~/Library/Application Support/Moi

- Michael