dxd,
Presumably, you are using Net::FTP. There is a rename method but it requires knowing the original filename first. I do not know if file globbing works in Net::FTP, but with regular FTP you can use mget when you aren't exactly sure of the name. In lieu of that, you can always use the ls method to get a list of files and then get matching files that meet your pattern. You can then rename/get each one individually.