Thanks for the explanation, Lin. That does make sense. It was just strange to me that I've been uploading slideshow files for several years now, and I've never had this problem before....only with the PTE program. Sherrie Thanks for your help, Ken........I zipped the file, uploaded it again, and it works now! So, you were right! I also learned something in the process - that I can zip a file pretty easily with XP.......just right click on the file, and the zip option is there in the drop down menu. And, thanks to you and Lin......I'm a happy camper to have this problem solved! Sherrie