Due to developing history of EDA tools, current mainstream EDA tools are almost developed on Linux or UNIX. This chapter is a study of discovering some methods or techniques to execute such UNIX-based EDA tools on Microsoft Windows platform without rewriting the entire program. In this chapter, XCircuit, an electrical circuit schematic drawing program executing on UNIX, will be put into experiment for discovering a way to execute the program on Microsoft Windows platform. XCircuit is an open-source program and authorized by General Public License (GPL). This can avoid some problems that may be caused by proprietary software. XCircuit is expected to port and execute on Microsoft Windows XP during the porting experiment in this chapter.