> Could you pls help me find out what has gone wrong with the way special
> characters are being displayed in my Word 2003 files in Bosnian, Croatian
> or Serbian (Latin).
...
> This problem started since I installed a Computer Assisted Translation tool
> in my pc.
> Do you think something has gone wrong with the general settings of my pc?
It looks like your system code page changed from 1250 (Latin 2,
Central/Eastern European) to 1252 (Latin 2, or Western European)
Try to change it back, reboot, and see if it solves anything.
The setting is in the 3rd tab of "Language and Regional Options"
(see http://www.mihai-nita.net/article.php?artID=20050611a)

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Mihai Nita [Microsoft MVP, Windows - SDK]
http://www.mihai-nita.net
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