Remember that the path is absolute, so you need the full path, even if the response file is in the same folder as the installer.
Note that the response file may also be empty (but it cannot be missing). If the response file is empty, no result file will be written but a status/error file will still be written to the temp directory.
Further note that the uninstall will fail if there is no corresponding entry for the installation in the .deliverycenter.installs file (in the user’s home folder) or that file is empty or missing (which can only happen through manual intervention). In that situation, the uninstaller will think that MyEclipse was not installed properly. However, the installation folder and any shortcuts/launchers can just be deleted.