D:\>perl -V
Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
  Platform:
    osname=MSWin32, osvers=4.0, archname=MSWin32-x86-multi-thread
[...]

D:\>test.pl
path SOFTWARE\Microsoft\Microsoft SQL Server
subkeys:
values: 100\, 90\, DACFramework\, DACProjectSystem\, RefCount\, Services\, SharedManagementObjects\, SqlPubWiz\, TSqlLanguageService\

Can't read SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names key: The system could not find the environment option that was entered