The items below cannot be "Saved as PT backup file" or "Exported as .reg file" (although the message box says "Done!" for each of those context menu options). They have populated subkeys. I haven't yet tried to remove them …
Data fields are: Error severity, Key, Entry's name, Value, Error description, Entry last modified
Medium, HKCR\AudioEngine\, {KEY}, {KEY}, Useless file extension, 14.04.2007, 13
Medium, HKCR\AudioEngine\AudioProcessingObjects\, {KEY}, {KEY}, Useless file extension, 14.04.2007, 13
Medium, HKCR\CompatUI.SelectFile.1\, {KEY}, {KEY}, Useless file extension, 14.04.2007, 13
Medium, HKCR\Microsoft.InformationCard.ElementBehaviorFactory.1\, {KEY}, {KEY}, Useless file extension, 14.04.2007, 13
Medium, HKCR\{2C256447-3F0D-4CBB-9D12-575BB20CDA0A}\, {KEY}, {KEY}, Useless file extension, 14.04.2007, 13
