Add scr extension to the Programs value.
Should be something like: Programs: REG_SZ: exe com bat pif cmd scr
Reboot
Create a shortcut on the desktop to the screen saver of your choice
Screen savers have extension SCR and are found in the system32 directory.
Target path for ssbezier : "C:\WINNT\SYSTEM32\SSBEZIER.SCR /S" where /S is the start immediately parameter.