ian said:
>   IF SYSTEM(_sysvers) > 799 and gFBHasNavServices 
>   THEN gFBUseNavServices = _True

um, navservices don't work too good on 8.1,
it takes some time for a dialog to present,
might want to bump up that 799 to fix that
if you expect users to summon many files...

-bowerbird