User blog comment:RottenBlock/Rance 4.1 and 4.2 32-bit Release!/@comment-44193731-20200129023656/@comment-31720212-20200129024946

There already is! My program is based on it.

http://takeda-toshiya.my.coocan.jp/alice/index.html

Scroll down and grab the link marked "system3 for win32." Extract and drag the System3.exe file from the system3 directory to any JPN System 3 game (back up the original, of course). In Rance 4.x's case, you may also want to install the music patches, but read the Readme first to decide. If you don't install it, you'll need either the physical CD or the free image to be mounted to play CD music.

If you have any trouble, send a message and I can try to help.