[texworks] How I can customize texworks ?

[Yves Soulet]

----- configuration info -----
TeXworks version : 0.4.4r1003 (official)
Install location : C:/texlive/2012/tlpkg/texworks/texworks.exe
Library path     : C:/Documents and Settings/SOULET/TeXworks\
pdfTeX location  : C:/texlive/2012/bin/win32/pdftex.exe
Operating system : Windows XP Professional Service Pack 3
Qt4 version      : 4.8.1 (build) / 4.8.1 (runtime)
------------------------------

Hello !

I begin using texworks. I find it is a usefull tool ; however ...
It seems to me that texworks.exe do not read the configuration files 
in the library (see above).
In the tw-basic.txt file, I have deleted the line xb:=\beta but the 
completion of xb gives \beta again !
So my question is :
my version is not configurable and what version I have to download ?
or what I have to do in order that texworks.exe read the configuration files.

List of the available files in the library :
folders --- files
completion --- tw-basic tw-beamer tx-context tw-latex
configuration --- auto-indent-patterns delimiter-pairs 
smart-quote-modes syntax-paterns
                   tag-patterns texworks-config
tug -- texworks.ini
dicts --- 3 dictionaries BUT when I want to check orthograph Texworks 
answer "no dictionary"
translations --- many files
templates --- many files

Thanks in advance.

Yves