FTP question

Hi. First post here, but used the site a lot before and hoping to get some help

Here at work we're using some a couple of different FTP packages (BatchSync, CuteFTP) to retreive data. We're using a filter to bring back all files that conform to the expression *3k7*, which it does happily. However, if we change the filter to *3k5*, it brings nothing back, the implication being that there are no files that match that filter. But after speaking to the owners of the other server, we know the files exist.

If I dispense with the fancy stuff, go back to first principles and use FTP from a command prompt and search for *3k5*, lo and behold they are there. They exist, and I can pull them back.

Is there something different in running an FTP from the command prompt that the fancy program may not be doing? While manual FTP is a short term fix, I need the scheduling and file comparison features that the interactive software offers.

Cheers
PSB1