I know a drider is a warped drow through magic and poisons and what not. SO do they still count as drow for things that target drow? Such as drow bane weapon, or a ranger with drow as a favored enemy?
In general, I'd say no. The creature is no longer a Humanoid of the Elf subtype. Within your own game, however, you might make exceptions - for instance, a magical item that ordinarily only works specifically for drow might still operate in a drider's hands - but that's house-rule territory, not 'official' rules.
