The Element Label configuration file is used for storing custom made Element Labels (used for assigning a label to a frame).
The Element Label configuration is stored in the following file:
< InDesign application folder>/Plug-Ins/WoodWing/ElementTags.xml
Note: This file only exists if a change is made to the default Element Label configuration. This can be done through the Element Label preferences which is part of the InDesign Preferences. (The file is also created by accessing the Element Label preferences and clicking OK without making a change.)