Did you check the documentation of if?
SYNOPSIS
         use if CONDITION, MODULE => ARGUMENTS;

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So it should be something like:
use if $^O eq "MSWin32", Win32API::Registry => qw(:ALL);

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HTH

Paul

In reply to Re^2: How to do a conditional load of a module ? by rev_1318
in thread How to do a conditional load of a module ? by davejavu

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