WinXP: how can I require() some locally held modules?

I experiment with the single-button-combination-lock example.
But I want to hide the code array in an external file and use it with require:

var code_code = require('combination_lock_code_code');
// var code = [3,1,2];
var code = code_code.code;

From the documentation I learned that I have to change the communication settings, so I entered:
file://C:/umerkel-modules

But I got some:
ERROR: SD card must be setup with E.connectSDCard first
WARNING: Module "combination_lock_code_code" not found

So: how can I use require to load some local module?
TIA, Uli

Update: just found where to put it: the MODULES subdirectory on the Project Path.