Trevor et al,
The easiest is this:
Insert the CD into the CD-ROM drive. Browse to the nveurX folder (where X is the number of the disc), then maps, then the folder you are interested in.
Disc 1: GB, GB+, Benelux, Benelux+, Scandinavia, NL Postcode and GB Postcode.
Disc 2: Austria, Switzerland, Scandinavia+
Disc 3: Germany, Germany - Austria - Switzerland - Poland - Czech Repub +
Disc 4: France, France+
Disc 5: Italy, Italy+
Disc 6: Spain, Spain+
In each of the respective folders you find a series of CAB files and an INI file explaining what each file is. You can open and extract the appropriate files from the CAB files using WinZip or Windows XP, and name them correctly as per the INI file. The files are even numbered in the INI file for your convenience.
As long as the folder on your CF or SD card is correct, TTN3 should see the map and know what's in it.
Stefan