One example would be to prompt the user, e.g., with the provided command-line "mame.exe {?}", the user would be prompted to enter a rom name.
EDIT: Now that there's a file browser, perhaps "mame.exe {%}" would allow the user to choose a file from the filesystem as a parameter. In this case you'd want it without an extension; maybe another symbol, e.g., {*} includes the extension. And we'd want to have a default rom path in the database for such uses. (I think we already covered that in the SQLite db).
One example would be to prompt the user, e.g., with the provided command-line "mame.exe {?}", the user would be prompted to enter a rom name.
EDIT: Now that there's a file browser, perhaps "mame.exe {%}" would allow the user to choose a file from the filesystem as a parameter. In this case you'd want it without an extension; maybe another symbol, e.g., {*} includes the extension. And we'd want to have a default rom path in the database for such uses. (I think we already covered that in the SQLite db).