Character Set Converter is a free toolkit for text file. That freeware should work on any platform that supports Java. It allows you to convert characters from one encoding type to another.
The basic principle is this:
1. first you must choose the text file to be converted
2. select the input encoding
3. select the output encoding
4. check log box for status
5. This tool should work on any platform that supports Java.

Requirements:
* Java Runtime

The license of this software is Free Trial Software, the price is $20.00, you can free download and get a free trial.