Roadhog doesn't want to do that for reasons explained above.
However, you could always just right click it, hit "Open with...", click "Choose default program...", look for your emulator (which I really hope isn't ZSNES, as ZSNES is fucking terrible and VLDC8 does not properly work in it, use ZMZ
instead, it looks like ZSNES but works
), UNCHECK the box at the bottom that says to always open it with that, then hit OK and it'll open the ROM in your emulator.
Then from now on you can just right click it, hit "Open with..." and it'll be there in the list, but open with LM by default.
Your layout has been removed.