I would have thought you should be able to rename the Directory/Folder "index_htm_files" (say) "old_site", create a new directory"index_htm_files" and then republish as normal. Whether this actually solves the problem, I can't tell.

I am not familiar though with Xara's hosting. Acorn is the expert here.

@Acorn: I think this is effectively what Xara has suggested, but I don't know what lurks under the covers of Xara's hosting.

Gary