Won't delete files older than 1 month

Hi there.

I'm having truobles deleting files that are not from this month. Also renaming won't work.

With files from this month I don't have any problems. I can delete and rename them.

Uploading is no problem, that works fine.

What can I do to change this?

I've found out what the problem is. The files I cannot delete/rename are file I've uploaded with my normat ftp-program.

Files I've uploaded with WebExplorer Lite can be deleted.

But is there a way to delete files with WEL that are uploaded with a normal ftp-program?

Thnx,

Leon