It’s been a while since I’ve used Helix or HX Edit, bit it occurs to me that the set of IRs that are loaded into HX Edit at startup are the ones that are contained in a specific IR folder on your computer, along with the preset and setlist files contained in sibling folders. Perhaps you can use that specific folder, not HX Edit, to see the full filenames and edit/delete accordingly? Presumably the next time HX Edit is launched your set of loaded IRs will be as you wish.