The Player's Handbook on favored enemy says, "If the ranger chooses humanoids or outsiders as a favored enemy, he must also choose an associated subtype, as indicated on the table" (47). The PH then goes on to list some available outsider subtypes like air, chaotic, earth, and evil. A ranger can't pick just outsiders and stab better every outsider from tritons to titans, for instance.
The prestige class shade hunter (Champions of Ruin 58-63) has as a special requirement for entry shades as a favored enemy. The Races of Faerûn description of shades says, "As creatures of the Plane of Shadow, shades are considered to be of the outsider type" (148), but that text doesn't mention shades as having any subtypes! Published characters seem to be of little help. For example, neither Anaruoch's shade Keevosen Nihili (31) nor City of Splendors: Waterdeep's Alauneth “the Black Viper” Orrane (69-70) has a subtype that would allow shades as a ranger's favored enemy pick.
Did shades ever receive one or more subtypes? If not, is there an official way that a creature can gain shades as a favored enemy so that a creature can enter the prestige class shade hunter, or must the DM make a house rule so that a creature can meet this prestige class's requirements?
Note: I know, "Who cares?" right? A level 4 shade hunter gains the relatively unique and seemingly natural ability tools of the trade, allowing the shade hunter to root around in his gear and "find" mundane items of his choosing that were previously not recorded among the shade hunter's gear, a special ability of which I am particularly fond. While a similar ability can be gained from the Dragon #354 feat Packrat (56) (with its hard-to-get-by-the-DM prerequisites) and from the extraordinary ability resourceful search of the Races of Destiny prestige class menacing brute (123-6), the shade hunter's is the more versatile and interesting. Alternatives to these three options for being able to mundanely produce gear instantaneously are appreciated but beyond this question's scope.