Ok, here we go:
1. Create a folder named "Oric-1" inside "mGalaxy\Data\BaseSystems"
2. Copy the (joined) icon inside it
3. Open "mGalaxy\Data\BaseSystems\BaseSystems.xml" with a text editor
4. At the end of the document, just before the "</Emulators>" ending tag, paste this block of code, save then quit:
<System type="Computer">
<Name ss="131" em="143" tgdb="" gb="">Oric-1</Name>
<Emu selected="0">
<Cmd id="0" hidden="false" name="Oricutron [Script]" value=""%path\%file%ext" --fullscreen"/>
</Emu>
<Extensions>.dsk,.tap</Extensions>
</System>
5. Open "mGalaxy\Data\Scripts" folder
6. Copy the (joined) file inside it!
Voila! Just open mGalaxy_Runway now and you will see that new Oric-1 system available!