I can't priview a downloading file
 

When Im downloading a file and I want to preview it it says couldn't open file b/c it was a bad file name

i have the smae problem for some reason maybe missing codecs windows media player will not preview any partial downloads so i use vlc go and download vlc media player then go to your incomplete files and drag and drop them into vlc

I dont know why but u cant preview AVI file unitl they are complete......