The call
(win32:set-application-themed nil)
in LispWorks for Windows now works when the call is made before any windows have been opened.
LispWorks 5.x programs which make an early call
capi:convert-to-screen
or
clim:find-port
to initialize windowing solely for the purpose of enabling
win32:set-application-themed
no longer need to do so in LispWorks 6.0.