I cannot reproduce your problem:

1. Copied the module Win32::TieRegistry and renamed the copy as Win32::TieRegistry64.

2. Changed package Win32::TieRegistry; to package Win32::TieRegistry64;.

3. Changed

   BEGIN {
       $PACK    = 'Win32::TieRegistry';
       $VERSION = '0.26';
       @ISA     = 'Tie::Hash';
   }
   [download]

   to

   BEGIN {
       $PACK    = 'Win32::TieRegistry64';
       $VERSION = '0.26';
       @ISA     = 'Tie::Hash';
   }
   [download]

4. Changed

   # Basic master Registry object:
   $RegObj= {};
   @$RegObj{qw( HANDLE MACHINE PATH DELIM OS_DELIM ACCESS FLAGS ROOTS )}=
   + (
       "NONE", "", [], "\\", "\\",
       KEY_READ|KEY_WRITE, $Flag_HexDWord|$Flag_FixNulls, "${PACK}::_Root
   +s" );
   [download]

   to

   # Basic master Registry object:
   sub KEY_WOW64_64KEY () { 0x0100 }
   sub KEY_WOW64_32KEY () { 0x0200 }
   $RegObj= {};
   @$RegObj{qw( HANDLE MACHINE PATH DELIM OS_DELIM ACCESS FLAGS ROOTS )}=
   + (
       "NONE", "", [], "\\", "\\",
       KEY_READ|KEY_WRITE|KEY_WOW64_64KEY|KEY_WOW64_32KEY, $Flag_HexDWord
   +|$Flag_FixNulls, "${PACK}::_Roots" );
   [download]

The resulting module contains the variable $Registry (a blessed hash reference) which is still accessible:

15:39 >perl -Mstrict -MWin32::TieRegistry64 -wE "say $Registry;"
Win32::TieRegistry64=HASH(0x17155bc)

15:55 >
[download]

Perhaps you missed one of the steps above? Or there’s something more you haven’t shown?

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