CONVERTCP
Text File Codepage Converter for the Windows command line
...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.