GPO icon with replace create new icon

Hi,

I have on desktop icons created by GPO, some icons are configured as Replace some as Update and they are as system object to run C:\Program Files\Internet Explorer\iexplorer.exe specifis www sites.
Now I would to edit these shortcuts to open it in default browser instead of Internet explorer, so I changed its as URL and saved.
Now the problem is these new icons are appear as new instead replace previous. So I have doubled every icons.