The windower forums has a good thread for this. I use this technique ALL the time. I actually have a Dual Layer DVD with all my FFXI files, registry export, and .bat file with all the .dll registration commands in it so I can just copy it over pretty much.
http://www.windower.net/forums/viewtopic.php?t=8434
That's the URL to the guide, but all you would have to do is change the InstallFolder, key to whatever the install folder. Open up regedit, and navigate to the following path.
Code:
HKLM\Software\PlayOnlineUS\InstallFolder
There should be three keys, 0001, 0002, and 1000.
0001
Code:
C:\Program Files\PlayOnline\SquareEnix\FINAL FANTASY XI\
0002
Code:
C:\Program Files\PlayOnline\SquareEnix\TetraMaster
1000
Code:
C:\Program Files\PlayOnline\SquareEnix\PlayOnlineViewer
Now you just need to change the path directory to wherever you copied the files to.
If nobody else knew that's okay. I had to search for months to find this answer.