[C:/tmp] cat x.pl
my $ret = system ("D:\\Program Files\\bin\\t.pl");
if ($? !=0 ) {
        print "ERROR: ret=[$?], err msg [$!]\n";
}
[C:/tmp] ./x.pl
'D:\Program' is not recognized as an internal or external command,
operable program or batch file.
ERROR: ret=[256], err msg [No such file or directory]