Windows not recognizing edited cursor with .cur extension

I slightly edited and then saved a cursor pointer, using the .cur extension. In Windows 10 I then tried to replace a cursor with the one I had edited. I browsed to the file with the edited cursor. But when I loaded the file, the image did not reflect the edits that had been made. What appeared was the unedited original image. After closing and re-starting RW and loading the .cur file the image does appear in its edited state, i.e., saving the file had not cleared the edits. I have also noticed that in Windows Explorer the icon for the edited cursor file shows the unedited original. So why didn't the edited image appear when I actually tried to use it in Windows? Any help would be appreciated