WARNING
If you are saving directly to a CD/RW I highly recommend that you stop
immediately. Saving or working directly with any form of removable media is
dicing with losing documents through corruption. Always work to/from the
local HDD and then copy or burn to the removable media. There are many posts
in these newsgroup of users who have learnt this the hard way.
In the case of CDs or CD/RWs, the action of writing to them always assigns
the Read Only attribute (nothing to do with Word). When you copy them back
to your HDD, you will need to select them in Explorer, right-click, choose
Properties and remove the Read Only Attribute.