Yes, got your idea. thank you. 
my $rootkey = "LMachine/Software/Microsoft/Windows NT/CurrentVersion/W
+inlogon";
$Registry->{"$rootkey//testkey2"} = [pack("L",0), "REG_DWORD"];

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In reply to Re^3: How to create new DWORD value in Windows Registry? by Anonymous Monk
in thread How to create new DWORD value in Windows Registry? by vios

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