Hallo:

only so far that every client uses his own partial file directory as default. As far as I know there is no servent which stores it's partials in win or dos preset [temp]-directory, so looking there is of no good.
A better tip would be:
First, have a look into your preferences; if there is not anything mentioned, look into the directory where your servent is installed into. Most likely you will find your file in a subfolder of this. :-)
If nothing helps try a file search ([Start], [Find] or 'dir [drive]:\yourfile.* /s'....... :-)

Greetings....