The path to the Program Files directory can be found in the registry at
HKLM\Software\Microsoft\Windows\CurrentVersion\ProgramFilesDir

The drive in which the script resides can be found using 

use File::Spec::Function qw( rel2abs );
my ($drive) = rel2abs($0) =~ /^([A-Z]):/i;

[download]

Note that this won't work if the script was launched using a UNC path. ($drive will be undef.)

In reply to Re: How to have universal perl script for C and D drive ? by ikegami
in thread How to have universal perl script for C and D drive ? by gasho

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