_Invk Source Files
_Invk files (short for "Invoker") are generated from the .RODL in a RODL-based server project, and contain helper classes that the Remoting SDK runtime needs in order to make your services accessible over the network.
The _Invk files will be overwitten automatically by the IDE as your .RODL changes. You should not make changes to them, and you generally will not need to care about their content.