Use spatialite extension for SQLite on Windows

I know that this has been asked in some similar ways before. However, all questions I found on this dealt with some very specific system setups which were not applicable for me (because so is mine).

System:

• Windows 7 64bit


• Python 3.4 64bit


• sqlite3 2.6.0 (shipped with Python I guess)


• Spatialite Windows binaries 2.3.1 (anything else of importance?)

How can I activate the spatialite extension for the ´sqlite3´ module?

What I tried (the way that other people in similar questions say it works):

• Downloading from http://ift.tt/14M0Zem :
  
  
  
  • libspatialite-win-x86-2.3.1.zip
  
  
  • proj-win-x86-4.6.1.zip
  
  
  • geos-win-x86-3.1.1.zip
  
  
  • libiconv-win-x86-1.9.2.zip
  
  
  
  


• unzipping all of them into the same folder on C:\


• (also tried only putting the DLLs into that folder)


• putting that folder into my system PATH variable

Then, running

import sqlite3

conn = sqlite3.connect(":memory:")
conn.enable_load_extension(True)
conn.execute('SELECT load_extension("libspatialite-2.dll")')

gives

conn.execute("SELECT load_extension('libspatialite-2.dll')")
sqlite3.OperationalError: The specified module could not be found.

What more can I try to make this work?