In win7, right clik on desktop and select personalize, then "all control panel items" then "region and language", then "additional settings", its the first option.

Keep the dir names small (less than 7 chars), and dont use spaces.

so

c:\bmw\db (for oem db files)
c:\bmw\db1 (for modded db files)

Give that a go mate.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.