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As to your second (non-Perl) question, "Can I open a file simply named 'C:/EDK'?" -- of course!

my $file = "EDK";
open (FH, '<', $file) or die "Can't open file $file $!";
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As to my phrase "second (non-Perl) question" your remark "I don't know how I would open a file without an extension name?" is not a question.

The point is NOT grammar-Nazi-dom; it's "be clear, accurate, precise and careful." And just BTW, were one to read your remark as "please tell me how to use Perl to open a file without an extension name" an appropriate answer would be perldoc -f open

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