$ perl -we'
open my $fh, ">>", "tabfile.txt" or die $!;
my $tab = "\t";
my @files = qw/ a.foo b.foo c.foo /;
foreach (@files) {
    print $fh $tab."- ".$_."\n";
}'

$ cat tabfile.txt 
        - a.foo
        - b.foo
        - c.foo

$ hexdump -c tabfile.txt
0000000  \t   -       a   .   f   o   o  \n  \t   -       b   .   f   o
0000010   o  \n  \t   -       c   .   f   o   o  \n                    
000001b