Yes it is windows
This is what it comes back with when I run it interactively.
C:\Ruby\myproject\lib> main_win32
C:/Ruby/myproject/lib/main_win32.rb:103:in `mainloop': Service_Main thread exite
d abnormally (Win32::Daemon::Error)
from C:/Ruby/myproject/lib/main_win32.rb:103
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