Susan, check in Preferences the path that is chosen, both for Captivate files and for the Cache files in the General settings. You have to be sure that cache and normal cptx files are not in the same location, because then when emptying the cache all files will disappear.
I'm not sure those are cached files, but if they are, normally they are stored in a folder with strange long names starting with CPD and then a long string with numbers and letters. If this is not the case, I have some suspicion that the cptx-file that is in reality a zipped folder with that kind of files, has been unzipped for an unknown reason? I know this can happen because when I send a file or a template, some OS do see the cptx (or cptl) as a zipped folder and propose immediately to unzip it. Could you check that with your coworker? Is there some setting that will unzip automatically zipped folders?
Lilybiri