CONVERTCP
Text File Codepage Converter for the Windows command line
...The "readme.txt" file and the Wiki gives you some more information.
You'll find the compiled tool for 32 bit (x86) and 64 bit (x64) Windows in the "bin" directory. The C source code is available in the "src" directory. Just click on the "Files" tab.
Regardless if you have or don't have a SourceForge account - whenever you have questions about CONVERTCP or you want to give feedback then you are welcome to post it in the forum. Click on the "Discussion" tab.