"Use of mpcorb.dat in Guide: To use the datasets in Guide, move either the mpcorb.dat or mpcorbcr.dat file into the Guide directory. The Extras menu in Guide has an option, "Use MPCORB", shut off by default. (If it is grayed out, it means that Guide can't find either .dat file.) When you use the toggle, Guide will swap to use of MPCORB data.

This has several pros and cons. Foremost among the advantages of MPCORB is that it is completely up to date, reflecting the latest orbits computed by the Minor Planet Center. The first Guide 7.0 CDs were made in November 1998, and plenty of asteroids have been found since then or had their existing orbits improved. For example, MPCORB contains numbered asteroids past 14000; the first Guide 7.0 CDs only go up to 9826. "

This is the in guide , but
I am not able to activate and display this function