As an aside to your meditation, if you're in Windows, you should be able to type just "filename" (without the .pl extension). If it doesn't work, you may have to edit your "Advanced system settings" (under System in the Control Panel), and add ";.PL" to the end of the PATHEXT variable in your "System Variables" list.

Even though I am not too put out by having to type the filename with the extension, I took your advice but need to reboot. Thanks!

Gives liverpole cookies!