That is normal and it is because the codecs on your DAV-DZ100 came with the firmware, and the firmware will not be up to date so soon as the online divx codecs for Windows get updated.
All you can do is upgrade the DAV-DZ100 to the latest firmware version that will contain the most recent divx codecs for this model. Still this will not guarantee that you can view all Divx compression formats.
It is the same on my DVD at home and there is nothing to do about that apart downloading latest firmware.
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