One of my students accidentally downloaded about 700 new asteroids
into Guide. (Extras > Asteroid Options > Add MPC Comets/Asteroids,
then one of the "Click to Download" links, probably "distant objects".
They all look like TNOs, Centaurs, etc.) At least, that's what I
assume they did. They are using custom mpcorb.dat files generated by
Find_Orb, but they are seeing a bunch of additional asteroids when
they have the "Use MPCORB" box checked.

There are far too many of them to delete individually from within
Guide. Is there a quick way to get rid of them all? I'm guessing
that deleting the downloaded file from the Guide folder won't do it.

Thanks,
Andy Puckett