ThemeDefs Sprite Ownership

A while back I put together a set of sprites to have my own theme (I prefer flat rather than ‘perspective’ icons). In my set I seem to have added sprites that aren’t in the standard sets and I can’t remember why.

Is there an allocation list or summat that might help me out?

Edit: Tried setting a dummy files type to each of the file titles. They all seem audio related apart from one called ptr_point. Where did I get them from and where do they belong? The titles run from ‘file_10b’ to ‘file_f96’ if that’s helpful.