thunderbird html.part on desktop

Hi, because here is some diskussion about thunderbird, i have also a thunderbird question: since about end of last year tumbleweed update, i notice, if i move an attachment from one mail to another SOMETIMES i see for a short time on my desktop something like: qegbhjj.html.part. on my machine it's automatically removed. on another machine, i did not personally use, from thunderbird, or maybe from firefox after a day of work one or two of this files are still on the desktop. so my question is, did anybody know why this happens and where i could switch the behavior to do the temporary file not on desktop, better place would be tmp file directory? simoN -- www.becherer.de