JAR2EXE Converter can easily convert a JAR file (MIDP application, such as Nokia Mobile Games) to an EXE file (Win32 NHAL Emulator).
This program will run Midp2Exe compiler to convert JAR file (MIDP Application) to EXE file (Win32 NHAL Emulator). Then, it will copy the output file and the runtime library to the output directory.
What you all need is the input jar file and this tool to test the game on the PC before the Nokia phone.
[Download JAR2EXE Converter]