* How to install it in Gnu/Linux
    * How to install it in Windows(Tm)
    * How to install it in Mac-OS(Tm) 

A - How to install it in Gnu/Linux
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For OpenOffice.org, under Gnu/Linux:

 1: Install any spellchecker for any language for OOo;
 2: Close Openoffice.org's quickstarter if it is activate;
 3: Copy the two files ar.dic & ar.aff to /usr/share/myspell/dicts/
         cp ar.dic /usr/share/myspell/dicts/
         cp ar.aff /usr/share/myspell/dicts/
- 4: Edit etc/openoffice/dictionary.lst to add:
           DICT ar TN ar
-5: From Tools -> options -> parameters linguistic: linguistic, Edit openoffice.org hunspell spellchecker and choose the languge arabic (tunis) [it must have the "ABC" flag]. 
 
B - How to install it in Window(Tm)
 ----------------------------------------------------------
For OpenOffice.org, under Window(Tm):

 1: Install any spellchecker for any language for OOo;
 2: Close Openoffice.org's quickstarter if it is activate;
 3: Copy the two files ar.dic & ar.aff to \Program Files\OpenOffice.org 2.1\share\dict\ooo
 4: Edit \Program Files\OpenOffice.org 2.1\share\dict\ooodictionary.lst to add:
           DICT ar TN ar
-5: From Tools -> options -> parameters linguistic: linguistic, Edit openoffice.org hunspell spellchecker and choose the languge arabic (tunis) [it must have the "ABC" flag]. 
 
C - How to install it in Mac Os(Tm)
 ----------------------------------------------------------
I have not MacOs to test it. If you have any information how to do email me. Thanks.