I had a space after it on mine, still wasn't doing anything. Tested it with different numbers just to see if it'd move the window, but nothing worked.
This is the line from the xml file:
<Page Activated="true" eq2opensound="ui_window_inventory_open" eq2usescomwndcontrols="true" Location="100,107" OnShow="Location=100,107" MaximumSize="1000,1000" MinimumSize="346,250" Name="Loot" ScrollExtent="346,250" Size="346,250" UserMovable="true" UserResizable="true" version="2.0.0">