You don't need to transfer the DAT file at all. As a matter of fact, this is the file you can erase when needed (e.g. if you have a map error at the same spot over and over). All that will happen is that Guild Wars will start downloading all maps etc. upon the next start of the program. If you wish to move the program, just download the client from guildwars.com and install it, everything else will be downloaded as needed.
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