Different encoding not working

[videk1]

$scope.csv = {
                    acceptSize: 102400,
                    acceptSizeExceedCallback: function () {
                        abp.message.error("File size exceeds configured limit (100kB)!", "File size");
                    },
                    content: null,
                    header: true,
                    headerVisible: true,
                    separator: ';',
                    separatorVisible: false,
                    result: null,
                    encoding: 'windows-1251',
                    encodingVisible: false,
                    uploadButtonLabel: "upload a csv file"
                };

This is my csv object. But i have a problem with encoding property. It looks like only ISO-8859-1 is working. I tried UTF-8, windows-1250, windows-1251 none of them seems to be working (character -> č for example becomes -> ?). Any suggestions? :)