How to import a Mame romhack that is not part of the official romset?

[Nocta]

I am trying to import Ultimate Mortal Kombat 3 Tournament Edition into Launchbox and I can see that it exists in the database but I can't seem to import it in my list of games, wether by dropping it in my Arcade platform or using the import rom files function.

Is there anything I can do to had this kind of "unofficial mame romhack"?
Thanks!

[JoeViking245]

1 hour ago, Nocta said:

Is there anything I can do

When in the Arcade platform, press Ctrl+N.  Type in the games Title.  In the Launching section, Browse to where the ROM is located and select it.  Click OK to save.

If it doesn't appear in with your other games, make sure you don't have 'Hide games missing media' (worded something like that) checked.  It'll be in the View menu.

[Nocta]

Thank you so much!