curiosity about "recent world'

Under 'File' why do some recent worlds show up as the world name and others show up as c:\program files...etc?

Is this a setting per world I need to check box?

I don't know why that happens. This stuff is done by the Microsoft libraries. Maybe some files are in the program path and thus the library omits the full pathname.

It's because you can specify relative paths in the world file with a text editor, but then MUSHclient converts them to absolute paths.