this code is 100% untested, but i think it might do something like what you want. i wish i had more time now, but i'll have to leave it to others to comment if you don't understand. sorry again to dump and run, but i hope this helps.

Update: okay, i found a couple minutes to comment the code and test the script. i've updated the code to a working version, and provided sample input and output. let me know if you have any trouble with this. if the comments aren't enough help, we'll be happy to explain what's going on.

#!/usr/bin/perl
use strict;
use warnings;
use 5.006;
$|++;

require Text::CSV; ## for writing a proper CSV file


## get arguments from the commandline
my( $infile, $outfile )= @_;

## set the template for unpacking the database
##   see 'perldoc -f pack' for details
my $template= 'A30A30A40';


## verify arguments or display usage
2 == @ARGV 
    or die "usage: db2csv infile outfile\n";


## open the files, $infile for reading, $outfile for writing
##   see 'perldoc perlopentut' for details
open local(*IN) => '<', $infile
    or die 'infile:', $!;

open local(*OUT) => '>', $outfile
    or die 'outfile:', $!;

## create a CSV object
my $csv= Text::CSV->new();

## set the input record seperator to 100 bytes
##   see 'perldoc perlvar' for details
local $/= \100;

## process infile a line at a time
while( <IN> )
{
    ## unpack the database record 
    ##   and create a csv record
    $csv->combine( unpack $template => $_ )
        or die "cannot create record $.:", $csv->error_input() || $!;

    ## print the string to the output file
    print OUT $csv->string(), "\n";
}
__END__
sample input:
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBBBBBBBBBBBBBBBCCCCCCCCCC
+CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCddddddddddddddddddddddddddddddeeeeeeeee
+eeeeeeeeeeeeeeeeeeeeeffffffffffffffffffffffffffffffffffffffff

sample output:
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA","BBBBBBBBBBBBBBBBBBBBBBBBBBBBBB","CCC
+CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC"
"dddddddddddddddddddddddddddddd","eeeeeeeeeeeeeeeeeeeeeeeeeeeeee","fff
+fffffffffffffffffffffffffffffffffffff"
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~Particle *accelerates*