To avoid this you need to add
dmg to the appropriate line in your
For example, in my RHEL 5.1 server I needed a line like the following in
application/octet-stream bin dms lha lzh exe class so dll img iso dmg
application/octet-stream bin dms lha lzh class so iso dmg dist distz pkg bpk dump elc scpt
For good measure, after making the change I did a
sudo apachectl graceful to ensure that Apache picked up the changes.