Setting values while creating sub-keys requires somewhat convoluted syntax, but is documented. 
use Win32::TieRegistry(Delimiter=>'/');
my  $ms= $Registry->{'LMachine/Software/Microsoft/'};
$ms->{'Junk1/'} = {   'Junk2/'=>  {'/Junk3' => ['JunkVal','REG_SZ']}  
+     };

[download]
This (tested) code will create the Junk1 key under Microsoft. Under that, under subkey Junk2, you will find the Name Junk3, which will contain the value "JunkVal".

     "There are only two truly infinite things. The universe and stupidity, and I'm not too sure about the universe"- Albert Einstein

In reply to Re: Registry String Values by NetWallah
in thread Registry String Values by mallen

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