I am not sure I understand your question- MUDs have a text interface, somewhat similar to a command line. It wouldn't be a proper MUD if it had a graphical interface- there are plenty of games out there that do this like Baldurs Gate. The files part of your comment I don't understand either.

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beardedwizard 11 hours ago | parent [-]

Simply untrue.

There have been hundreds of MUD clients and many of them were not purely text based at all. Many had images and map screens built in.

	▲	rascul an hour ago \| parent [-]
		MUDs are text based. Some of the clients can have graphical features but the basic way to interface with the MUD itself is with text.