Windows 7自我/自动更新可执行文件

I've had a custom auto-update feature for my programs ever since Windows 95. It used to work fine, until Vista and then Windows 7. What it basically did was to download the new executable, create a batch file and execute it. The batch file simply waited for parent executable to close (by constantly trying to delete it) and then move/rename the downloaded new one as the old one. And even run the newly downloaded one. This worked fine for years. But Windows 7 doesn't really like me to do that. One thing is that it "knows" the executables are no longer same (even though their names and paths are same). I've had a custom auto-update feature for my pr