Dears, I am Hyun-Cheon Hwang in DSIC, Korea. I downloaded the Python.Net 1-0-beta3, and I compiled the source. When compiling I found the Error. In CallConvUtil.cs line 43, here, reader = File.OpenText(inputFile); writer = File.CreateText(outputFile); in Korea, like non-english country, Encoding error occured. So, I modified the source like below, reader = new StreamReader(inputFile, Encoding.Default); writer = new StreamWriter(outputFile, false, Encoding.Default); Then I finished the compliing. Have a good day..!! mailto : panty74@unitel.co.kr mobile : 010-6356-0670 blog : http://blog.naver.com/panty74.do