I to am a returning player after 5 years i could not even find my original disks so i used the sony launcher to install the game the path is a little convoluted.

C:\Program Files\Sony Online Entertainment\Installed Games\EverQuest\maps

but if you are trying to manipulate the files via my computer it looks like

C:\desktop\computer\INSERT YOUR DRIVE NAME HERE\program files\Sony Online Entertainment\Installed Games\EverQuest\maps

this is with a factory install of Vista on a toshiba laptop

i hope this helps