The func_door uses the CBaseEntity class in HL. That code does not exist in V12 so you will not be able to use the hl.fgd with V12. The fgd entries for WC are used to be able to place entities in your maps then when the map is loaded in the game, the game knows what classes to spawn, where and with what values.
In the v12.fgd (located in your V12 SDK), there is an entity called Door_Elevator although I havent tried it yet. All the entities that I beleive are supported by V12 are in there so when your creating V12 shapes, make sure you create a new configuration and specify v12.fgd as your entity file and not the hl.fgd.
Torque Owner Eric PL Smith
In the v12.fgd (located in your V12 SDK), there is an entity called Door_Elevator although I havent tried it yet. All the entities that I beleive are supported by V12 are in there so when your creating V12 shapes, make sure you create a new configuration and specify v12.fgd as your entity file and not the hl.fgd.