You might also try using File::Spec to help you out with the path information.

use strict;
use warnings;
use File::Spec;

my $path=File::Spec->catfile('C:',"Program Files","Microsoft Office","
+Office","Excel.exe");

print "\$path gives you: $path\n";

__END__

Output:
$path gives you: C:\Program Files\Microsoft Office\Office\Excel.exe.
[download]

Of course, the spaces in the path might still give you problems. You may need to use literal quotes around the path to prevent problems.

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"Ex libris un peut de tout"