The Windows command prompt is like one of the ~unix shells. for example:

#------------------------------------------
my $operatingSystem = $^O;
my $windows         = "MSWin32";
my $unix            = "hpux";
print "Running under ${operatingSystem} environment.\n\n";
my $pathSeparator = "";
if ( $operatingSystem eq $windows )
{
    $pathSeparator = "\\";
}
else
{
    $pathSeparator = "/";
}
#------------------------------------------
[download]

pathSeparator of "/" works on Windows and ~Unix (LINUX, etc..)

Where it really matters, the logic above to determine the OS is woefully inadequate.