The 64-bit client is scary. If they ever stop supporting the 32-bit client, I'm afraid it may be game over for the mod, unless you find somebody with knowledge of the client internals.
What the ExtractSchemas program does is it searches the client program in memory, looking for a specific long series of machine instructions that include the address of certain needed data structures in memory. I thought it might be possible to make it work with the 64-bit client by changing addresses to 8 bytes, but after doing the obvious things, it still wasn't finding what it needed. Maybe someone smarter can figure it out, but I'm very pessimistic about my own ability to do so...