Folders with ZZ..ZZ..Z... like names

[MMG]

Dear Community

Any of you already faced this ? A folder under D:\ has hundreds of subfolders with bizarre names (see attached screencap). All are empty but I find it really weired.

Thanks in advance for your replies.

MMG

[gerbil]

Do you have CCleaner? Is it set to under Tools > Drive Wipe to Wipe Free Space on that drive? Then uncheck that, delete the folders. By free space, CCleaner means space occupied by already deleted files [the files often still exist unless overwritten, but the pointer in the file manager is altered so as to show them as deleted].
If it is not set to wipe free space then it is playing at wiping some drive space, so uninstall CCLeaner, reinstall it, and delete those folders.

[MMG]

Many thanks Gerbil for clarifying this. Yes indeed, CCleaner is installed and that option is checked.