In mGalaxy > Data > Definition, you should create a folder called "Watara Supervision" and put the (enclosed) icon into it.
In mGalaxy > Data > Definition > Systems.xml, you should add those line just before the </Systems> tag:
<System name="Watara Supervision" type="Console">
<DBID pc="watara_supervision" ss="207" em="Watara_Supervision" tgdb="Watara Supervision" gb="147|SVIS"/>
</System>
In mGalaxy > Data > Definition > Emulators.xml, you should add this line
<System name="Watara Supervision" option="potator_libretro.dll" script="false" cmd="-f -L cores\potator_libretro.dll "%path\%file%ext"" extensions="bin|sv"/>
just after
<Emulator name="RetroArch" hidden="true">
<Systems>