If your "FTP folder" is actually on the NT box, Win32::ChangeNotify would be a good solution. You can basically set your script to wait until a change in the directory (i.e. adding files) happens, then run whatever code you need to. Less messy than playing with NT's dog-awful at command.

Update: I knew I had some code that used it somewhere. Here's a simple example:

use Win32::ChangeNotify;

my $dir = "c:/some/dir/name";

$notify = Win32::ChangeNotify->new($indir, 0, FILE_NAME);

while (1)
{
 $notify->wait or warn "Problem waiting: $!\n";
 # Will now wait to execute following code
 # until a file event happens in $dir

 # ...stuff ...

 $notify->reset;
}
$notify->close;
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I put the while (1) for brevity. In my actual code, I test to see if the script should be "finished" by checking for existence of a semi-lockfile and do while (!$done).

Guildenstern
Negaterd character class uber alles!