You can get a list of commands for Imagew by running it on a machine with /? at the end.
You can also try the Wizard to help you set this up.
In this case it looks like you may have used the Wizard and Selected the ImageW V2 which has different switches.
If you are trying to use Imagew V2 change the path to \\stsitvs-ldcore1\ldmain\osd\imagew2\imagew.exe
This should work if you are using imagew (V1)
/RN /O %ImageShare%\%XP_Image_Name%
Don't forget to double check the variables... If you have a "\" at the end of the image share variable the command above would fail.