Try This, this will get most of them -
Change the extension so the file is "nomajong.bat" put it in the rom dir and run it. This will create a dir called c:\majong and move those files into that dir.
I am working on a set of batch files to do this stuff right now for the Omega Mame. I also have the following, though these just do a straight delete;
remsports.bat
remlightgun.bat
remadult.bat
remquiz.bat
remmaze.bat
remclone.bat
rempuzzle.bat