In message <9ff585ea50.jim@xxxxxxxxxxxxxxxxxxxx>, Jim Nagel <opro@xxxxxxxxxxxxxxxx> writes
it seems to handle a couple of hundred formats, so no wonder they don't talk loudly about all of them. www.autohotkey.com/forum/topic2941.html
In that forum, Acorn is mentioned for "nconvert.exe part of the xnview package", not topng.
There have been a number of changes to the Acorn sprite format, and even the oldest files have some subtleties - best bet would be a project that has had input from ex Acorn programmers.
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