You're still very unclear, but I'm pretty sure you want the following:

For each file matching *.rtf, print its name if that directory also has similarly named file with the .ftp extension.

my @dirs = File::Find::Rule
   ->directory()
   ->in('.');

for my $dir (@dirs) {
   my @rtfs = File::Find::Rule
      ->maxdepth(1)
      ->file()
      ->in($dir);

   for my $rtf (@rtfs) {
      ( my $ftp = $rtf ) =~ s/\.rtf\z/.ftp/;
      if (-e $ftp) {
         print("$rtf\n");
      }
   }
}

[download]

Update: Condensed: 

my @files = File::Find::Rule
   ->file()
   ->name('*.rtf')
   ->exec(sub{
      my $rtf = $_;
      ( my $ftp = $rtf ) =~ s/\.rtf\z/.ftp/;
      -e $ftp;
   })
   ->in('.');

[download]

In reply to Re: Printing files that has two different extensions in a given directory by ikegami
in thread Printing all the files that have both ".rtf" and ".ftp" by searching recursively in a given directory by Anonymous Monk

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