I'm going to program and develop a windows application
and I want to use Persian in user interface.
I'm using Windows XP and uni-code in programming language.
But is there any trick or rule to make application working fine in
older windows? (98, ME)
Or just using uni-code makes anything fine?
Win9x does not support Unicode internally.  M$ has developed the so-called MSLU[1] which provides Unicode compatibility at the Windows API level for Win9x.  I have used it, and it indeed works, but be warned that these OSes do *not* support Unicode anyway, and all MSLU can do is implement API stubs for Unicode versions Win32 functions (such as, CreateFileW) which would allow you to build your app in Unicode mode in Visual C++.
 
What I've ended up doing in the past is do all the UI as HTML, and embed a HTML rendering engine in my app.  I've used the WebBrowser control (the same control used by IE).  This requires you to distribute a customized[2] version of IE with your own app which has "Arabic" support built-in, and write some amount of _javascript_ code to enable the user to type Persian in your application even if they don't have a Persian keyboard installed (you can find several JS codes as starters on the web for this purpose.)  You can also use Gecko, which is Mozilla's great HTML rendering engine as well.  If you decide to use the WebBrowser control, check out http://www.beginthread.com/Article/Ehsan/WebBrowser%20Goodies/ for some articles about possible customizations of the control that you may be needing in your own applications.
 
All of this, of course, applies to Visual C++.  If you use some other programming tool, then you'll have to research on your own, though I think that few support MSLU.
 
[2] You can deploy a customized IE install using the IE Administration Kit (IEAK.)
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