1) Put all the refiller files into the Diablo II Directory
2) Edit auto-cdkey.reg and specify owner, cdkeyexpansion, cdkeyclassic and the mpq file.
3) Run the reg file (it will add the info to the registry)
4) run the d2cdkey.exe file and refill both keys. It might ask for your diablo II directory. Browse it and press OK. It might also ask if you want to procedd because that directory already exists, press YES.
5) mpq should be created