Visual Studio surely, as they had a collaboration with Microsoft using Windows CE for the Dreamcast.

https://jacobfilipp.com/MSJ/directx.html

"What happened to Windows CE on the SEGA Dreamcast?"

https://www.youtube.com/watch?v=QKHSlBi5qok

"Making Dreams Come True - Sega's Katana!"

https://www.youtube.com/watch?v=EIr9YnMgExA

Maybe it was for the Saturn and previous consoles?