>>Thanks Olaf. The method below is what I think, do you think it's reasonalbe?
>>1.Install both Windows and ReactOS on the virtual machine such as VirtualBox.
>>2.Enter windows system, cause it can share file between virtual machine and the PC outside the virtual machine.
>>3.In windows, overwrite the file which I modified and reboot the virtual machine.
I am not Olaf but i don't know what you are trying to achieve.
If you want to test the behavior of a ReactOS file in Windows (replacing the original with the ReactOS one) then you are right, that is the way.
If you want to test your compiled file in ReactOS then use MagicISO/PowerISO to create an ISO file from that compiled file, then attach that ISO file to your ReactOS Virtual Machine (as you did when installing ReactOS on it).Run the ReactOS VM, access to the CdRom drive and voila you will find there the compiled file.