I suggest fat32, Google for wbfs2fat for a tool, but there's no guarantees so it's always best to backup your files the old fashioned way first as a precaution
Fat32 is recommended, and support for ntfs may get dropped in the future for some apps or cios, so I would just do that. But after converting to fat32 you can convert from fat32 to ntfs using windows command prompt, lots of tutorials online for that, here's one I found after a quick Google search
https://www.thewindowsclub.com/how-to-convert-fat32-to-ntfs-without-losing-data-in-windows