Renaming Files

I have created a new Lectora file by using the 'saving a copying of the title' function and then just reworking the exisitng title with new information. Now, I have changed all of the file names within the Lectora interface but the actual files on my drive still have the name of the originally created course. When I go to rename the files on my drive (external from Lectora), I get a warning that the files may become unuseable. Any ideas?

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