Can i process utf8 datasets or files

Java can process UTF-8 files without any problems, it is just that Java uses a different encoding for displaying them under Windows (= "Cp1252"). If you change the file encoding to "utf-8" everything should be fine. If you are running WEKA directly from the commandline, just add the following parameter to your commandline:

-Dfile.encoding=utf-8

If you are starting WEKA from the Start menu, then edit the RunWEKA.ini file:

• If a fileEncoding placeholder already exists, then just change the value from "Cp1252" to "utf-8" (without the quotes of course).
• If there isn't a fileEncoding yet, just add the -Dfile.encoding=utf-8 parameter to all the java/javaw commands).

For Korean users, the following was suggested:

• Save ARFF file as UTF-8
• Use cp949 for RunWeka.ini
• Check Unicode Utf-8 in Region Settings