(setq indent-tabs-mode nil) not working in 21.2b36 on NT?

I'm running: XEmacs 21.2 (beta36) "Notus" [Lucid] (i586-pc-win32) of Wed Oct 11 2000 on NEVERYON Even when I have indent-tabs-mode set to nil, XEmacs is inserting tabs for indents. Doesn't matter whether I use (setq-default indent-tabs-mode nil) to set it globally, or use (setq indent-tabs-mode nil) to set it buffer local. Also doesn't matter whether it's cperl-mode, java-mode, cc-mode, or just good ol' text-mode. I searched back through the xemacs-beta archives and saw this same thing reported last back in July for b34. I am still seeing the same problem with the 21.2b36 binary for NT. So assume it has not been fixed. I built the 21.2b36 from source on RedHat Linux 6.2, and using the same .emacs options file... it works just fine. Also works just fine on XEmacs 21.1.9 on NT win32. BTW, diff'd lisp/indent.el from XEmacs 21.1.9 with this one, and it hasn't changed since then. So it's gotta be lower down. Suspect it's in the indent.c somewhere, which was also the conclusion of the last round of discussions that I read. So what would cause indent.c to function differently on NT than on Linux? One thing I did not do is build on Linux with mule support, and maybe the NT binary does? Am out of ideas unless I get a chance to re-compile it myself from scratch on NT (which sounded sorta involved)... I'd rather not do so if someone else has any better ideas. Thanks! Troy