[Zope] charset in Zope-2.6.0 : Error Type: UnicodeError

Hi, I work with Thai charecter set tis-620 on 2.5.0 it run smooth but on 2.6.0 when I put Thai set in Properties Tab to discript a folder in Thai a messages shown : Error Type: UnicodeError Error Value: Latin-1 encoding error: ordinal not in range(256) Can I set charector code somewhere inside Zope-2.6.0? (I am a user who never known any program script but can followed by instuction sheet! :)) Thanks, Viriya