Let lyx1.6 support xelatex

I found a way to let Lyx support Xetex.

Note: The method is for windows user
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Firstly:
close Lyx if it runs.
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secondly:
Find the file "C:\Program Files\LyX16\Resources\lyxrc.dist "
and Add the two lines at the end of this file.

\format "pdf4" "pdf" "PDF (xelatex)"  ""   ""   ""   "document,vector"
\converter "pdflatex" "pdf4" "xelatex $$i" "latex"

Then, reopen Lyx, you will see a menu item "view->pdf(xetex)".
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thirdly:
Open the file "C:\Program Files\LyX16\Resources\ui\stdtoolbars.inc "

Find the text string: Toolbar "view/update" "View/Update", and add three lines below this string.

Separator
Item "View PDF (xelatex)" "buffer-view pdf4"
Item "Update PDF (xelatex)" "buffer-update pdf4"

Then, reopen Lyx, you will see there are extra buttons support for compiling using Xetex.