Unicode class>>#parseUnicodeDataFrom: is the method in charge of initialize the unicode tables telling when a char is lowercase, or digit, etc.. But it has no senders :). Maybe a first try can be something like the case mappings: Unicode class>>initializeUnicodeData UIManager default informUserDuring: [ :bar| | result | bar value: 'Downloading Unicode data'. (result := ZnEasy get: ' http://www.unicode.org/Public/UNIDATA/UnicodeData.txt') isSuccess ifFalse: [ ^ self error: 'Download failed' ]. bar value: 'Updating Case Mappings'. self parseUnicodeDataFrom: result contents readStream ]. Now, is http://www.unicode.org/Public/UNIDATA/UnicodeData.txt the correct file to load the data from? BTW, I executed that code in my image and It broke into pieces, so the existing initialization may have some problem. Dunno what happens yet. Guille