http://foswiki.org/System/AccessControl#Controlling_access_to_attachment has the Apache config line
RewriteCond %{REQUEST_URI} !^/+foswiki/+pub/+Foswiki/+.+
which I think is a result of the TWiki-->Foswiki rename. It should refer to System
RewriteCond %{REQUEST_URI} !^/+foswiki/+pub/+System/+.+
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