i wonder could i change the saving name in cache automatically or 

i use foxit reader open a pdf file, the final '''''url name''''' is xxxx.pdf, when i click the save or save as i get s'''ome strings '''as the fileneme for example, 529EDd01.pdf. the same as the name in the '''cache folder'''. So i think , first the pdf file xxxx.pdf is saved in cache , changed name as 529EDd01, then the foxit reader open it. then the name could never the same as the url name xxx.pdf. i wonder could i change the saving name in cache automatically or is there another way to solve this problem, (mimetype do not work). (for the firefox browser is closed the cache would been deleted, so security is not considered much). Thanks for your attention. thanks very much for trying to solve the problem, for it bothering me too much.