Error from open(IO::Handle=GLOB(0x2acc2e8), <&STDIN): Bad file descrip
+tor at C:/Perl64/site/lib/Capture/Tiny.pm line 99
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The problem is that each of the 'fork's, it re-opening the same glob for stdin. Under unix, this works because each fork is a new process, so the re-used glob is unique within its own process space.

But under windows, each 'fork' is actually just a separate thread, within the same process space, so the re-used glob -- despite that it is cloned at the Perl level -- is trying to concurrently reuse the same underlying per-process OS buffers and data-structures; with the inevitable consequences.

When it works, it is by pure chance. Mostly it won't.