Unfortunately, that fails due to limitations of glob() on some platforms (read, Windows).

Could you clarify on the limitation. Perl's standard glob function seems to work fine for me?

P:\test>perl -le" print for glob 'c:/test/words/*/*';
c:/test/words/a/aa
c:/test/words/a/ab
c:/test/words/a/ac
c:/test/words/a/ah
c:/test/words/a/ak
c:/test/words/a/al
c:/test/words/a/am
c:/test/words/a/an
c:/test/words/a/ar
c:/test/words/a/as
c:/test/words/a/au
c:/test/words/a/aw
...
c:/test/words/c/aa
c:/test/words/c/ab
c:/test/words/c/ac
c:/test/words/c/ad
c:/test/words/c/ae
c:/test/words/c/af
c:/test/words/c/ag
...
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