V 0.9.1 fixed back for external files with absolute path

if external files are not in the user nor the factory folders then the error "cannot concatenate 'str' with 'Qchar'" was raised.
Fixed by converting str object into QString. without the QString cast the error "cannot concatenate 'str' and 'QChar' objects"
                    is raised and only if the first part is a str object (not the other way round)