Drag the XML File onto the AR Manager window and onto the game's codelist ON THE AR, not the Manager's Database.
Conversely, you could open the XML in a text editor (Word, Notepad, Wordpad, etc.) and copy just the codes you want and paste them into the AR Manager manually.
Also, I'm not a mod, or the starter of this thread, but I would like to ask that when posting codes, please use the spoiler tag, as some of the more specific codes get very lengthy. Just for the convenience of everyone viewing. Nobody wants to scroll down a wall of codes they aren't interested in.