The answer here is the
bp in the tag... it indicates "BackPack" which was a term used by
MICRO-SOLUTIONS (enter just as seen) of DeKalb, Illinois who make various items of add on drives etc...
They offer in their downloads a UDF Reader (
bpudf208) compatible with "BackPack" products
And in my case downloading that and installing it cured the error...
It may be that any UDF Reader... such as Roxio/Adaptec or Nero would also do the same.
Address as;
http://www.micro-solutions.com ... since there is/are others using similar names that do not contain the information required