That's because Unicode values are different from Alt Codes. I'm having the same problem myself...also with Czech letters! I have yet to find keyboard "Alt" codes for most of the special letters, but what I do recommend is bookmarking the page
http://czech.typeit.org which allows you to compose your message and push buttons for special characters as needed, then you can copy and paste into another program when you are finished.
You can also just find yourself a webpage with the special characters on it and copy/paste as needed. It sucks, I know, but if anyone has a better way, please let us know!
Feel free to copy and paste from here:
?? Čč Ďď ?? Ěě ?? Ňň ?? Řř Šš Ťť ?? Ůů ?? Žž
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