Version:           1.6.1 (using KDE 3.2.1, SuSE)
Compiler:          gcc version 3.3.1 (SuSE Linux)
OS:          Linux (i686) release 2.4.21-99-athlon

This what I get if I try to send file with russian filename. 

--Boundary-00=_BK7hAzR6trxLXwr
Content-Type: application/x-msword;
  name*=koi8-r''%F0%C5%D2%C5%DE%C5%CE%D8%20%D4%C5%CD%20%C4%CC%D1%20%CF%C2%D3%D5%D6%C4%C5%CE%C9%D1%20%CE%C1%20%D3%CF%C2%D2%C1%CE%C9%C9%20%F5%F0%F2%20%E4%E2%F3%201%2Edoc
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
	filename*="koi8-r''%F0%C5%D2%C5%DE%C5%CE%D8%20%D4%C5%CD%20%C4%CC%D1%20%CF%C2%D3%D5%D6%C4%C5%CE%C9%D1%20%CE%C1%20%D3%CF%C2%D2%C1%CE%C9%C9%20%F5%F0%F2%20%E4%E2%F3%201%2Edoc"

Such mailers as Outlook and The Bat doesn't understand "name*" and "filename*" parameters and save attachment with name generated by themselves