Try the following: In CC Master go to the the queue monitor and then click on the link to open the queue directory. Look in the archive folder. Check to see if it is listed there with the file extension ".xml_unsupported"? If it is, you can change the file extension back to just .xml and move it to the pending/ priority folder of your choice (normal by default) and the engine(s) looking at the queue should be able to pick it up again.
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