The WorkflowClient.dll file is used by the Unwired Platform messaging server to transform the data that is sent to the device as notifications, and to respond to online request and submit workflow actions from the device.
The supplied WorkflowClient.dll file loads the metadata in the WorkflowClient.xml file to determine how to map the data in the workflow message to and from calls to Mobile Business Object operations and object queries.
The WorkflowClient.dll is shared by all Mobile Workflows. It is installed only once, into the UnwiredPlatform_InstallDir>\UnwiredPlatform\Servers\MessagingServer\bin folder. Your Manifest.xml file must refer to the WorkflowClient.dll as a shared file. It does not need to be included in the Mobile Workflow .zip file.