I am assuming that the advice Acadia and LaurieA is already common knowledge and the real question you are asking is: are there easier ways to transfer files between runtimes?  Other than using your browser to transfer files, you can useP3D0 Explorer.  It is geared towards 3d model usage and interface friendly.  And it is free.  Since you are interested in just transferring your pose files, this should make it easier.  Just make certain that your new external runtime follows the same convention as your main folder.