Interesting and very useful for sorting. However, I had a non-part file in the parts folder for some reason and it caused it to throw an error while sorting. The good thing is it did rename the parts and the part folders; but upon reopening, the parts sorter did not realize that the sorting had already been completed and gave me no option to restore to the original names. Leaving my parts stuck with the new names. Attempting to run it again left me with "Aero_Aero_deltaWing_Delta_Wing_Delta_Wing". Perhaps if it throws an error then force it to undo the sorting? I used a backup install just in case something like this happened; so no worries. It's not a big deal as you shouldn't really have random stuff in the parts folder anyway lol. Otherwise this thing is really useful!