download file error

Download (open) file error :
We are using Portal Document Manager (WebSphere Portal 5103 )  with IE 6.0
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For example, there is document with unicode (russian) name:
"                .   8    ..xls"
and we want to download it.

The browser ask: "Save or open "
If we select "Save", the browser suggest to store file with name:
“           +    [1].+  +8+   ..xls”  It is o.k. 

But if we select "Open" - we recive error message from Excel:
"File not found: C:\Documents and Settings\alexshr\Local Settings\Temporary 
Internet 
Files\Content.IE5\0ZSZST82\%D0%BE%D1%82%D0%BF%D1%80%D0%B0%D0%B2%D0%BB%D0%B5%D0% 
BD%D0%B8%D0%B5+%D0%BF%D0%B0%D1%81%D1%81[1].+%D0%B7%D0%B0+8+%D0%BC%D0%B5%D1%81..xls"

But this file really exist. It has too long name, because there are codes 
instead of russian letters

Can you help me 

Thanks!
Alexander, alexshr@yandex.ru