Just checked the OTS docs. There should be a folder referenced to as $ModulesDir$ and under that folder there should be a folder called "Docs" for the third-party documentation. However, it might be that the themer typed MuduleDir instead of ModulesDir. Happens sometimes to myself. It's right in Excalibur II though. You might want to check that there is a backslash at the end of the ModulesDir path.