Hi @Omichi
If you want to use NLua/KeraLua for both x86 and x64 just create a x86 and x64 folder in the same directory of KeraLua and put the lua52.dll on the respective folder.
NLua.dll
KeraLua.dll
+ x86
lua52.dll
+x64
lua52.dll
Also. NLua will not work with the regular lua52.dll from luabinaries (because there is a few more methods added to the Lua52.dll like luanet_pcall and others. The binary lua52 available from NLua website/github is 100% compatible with the original Lua, actually is even better because the oficial release doesn’t contain the latest patches http://www.lua.org/bugs.html#5.2.3-2.