Maybe you should add the mime type as well?

Something like (not tested): if(variables[part->disp_params->name+".mimetype"] && arrayp(variables[part->disp_params->name+".mimetype"])) variables[part->disp_params->name+".mimetype"] += ({part->disp_params->mimetype}); /erik

This is a response to: http://lists.lysator.liu.se/pipermail/pike-devel/2011-October/014499.html