>>are you trying to copy in c:\ ?
>>it looks like there is privelege problem.try to run vfp9 as administrator and view folder/files in windows explorer.
>
>The invisible folders/files are in the VFP9 folder. I can create new files in the folder and see them there. But when I query the folder from Fox (DIR *.*) I see not only the file I created, but the ones I should be seeing from the File Explorer.
>
>While I have not found the source of the problem, but I have resolved it by restoring the folders and files from a backup. Only lost a days work. Oh well, its better then wrestling with it.
>
>Thanks for all the help.

You mention the VFP9 folder -- do you mean a folder somewhere under special folders like "c:\program files (x86)\" ? You may be running into a potentially confusing feature of UAC Virtualization. Try looking in %LOCAL­APP­DATA%\Virtual­Store folder ( i.e. hidden folder c:\users\username\AppData\Local\VirtualStore ) to see if the folder and files in question could be found there.
https://blogs.msdn.microsoft.com/oldnewthing/20150902-00/?p=91681