That's odd. Since you do actually have a supported version of datatypes.library, I think the next step is to run
SnoopDOS to see what it is actually causing it to fail. It may be that you have some other file missing which is preventing datatypes.library from working which is why it reports a failure to load datatypes.library.
You would need to put SnoopDOS in your startup-sequence, somewhere before AfA_OS_Loader. The line you would need to add would be something like:
Run >NIL: Path:To/SnoopDOS/SnoopDOS
(obviously correcting the path to point to wherever you put SnoopDOS)
That will cause a SnoopDOS window to open before AfA_OS_Loader tries to launch, and you can then check the SnoopDOS log window for errors related to AfA_OS_Loader or datatypes.library.
Edit - WBStart won't help you here.
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moto