Close, "resources.xml" is what you are looking for. If you are using a standalone instance of Websphere, there is probably something close to this:
$WAS_HOME\profiles\PROFILE_NAME\config\cells\CELL_NAME\nodes\NODE_NAME\servers\SERVER_NAME\resources.xml
PROFILE_NAME, CELL_NAME, NODE_NAME, must have the machine name in them by default. SERVER_NAME is configurable, but I believe that the default is "server1".
Sorry, I could not be more specific, but there are many variables in websphere settings.
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