There is an issue with File::Find (and hand-rolled solutions too) on win32 when working
with mapped file systems. It will stat every file to determine whether it is a directory and needs to be
recursed into. Each stat requires a server round-trip which
can be slow.
If you call the DOS function you can do the whole thing in
one hit. If you are certain the script will never be needed
on a non-win32 system there is no issue with portability.
I was doing something similar a while back, and reduced
the run time from several hours to under ten minutes.
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