.dvi file extensions displaying instead of PDF uploads
I have a 25 PDF files sent by a professor to add to his course site. Each file shows the extension .pdf and when I double click the filename, it opens and displays properly in Acrobat. When I upload the file through UPLOAD AND MANAGE FILES, it shows a different filename extension, .dvi. For instance a filename of 01_complex.pdf appears in my browser as complex.dvi and then as the name in the iTunes U course site as complex.dvi. I have opened these files in Acrobat and done File As and the same still happens. I dragged each of these files into iTunes > Books, done Get Info and entered a Name, artist, year, album and genre info and then uploaded those files with the exact same result. (location ..Music:iTunes:iTunes Music: Books: Artist Name: fullname of track that I entered and saved). Why is this happening? How can I get the correct names etc. uploaded to the iTunes U site? BTW, I think the prof saved the files to PDF from TeX but have not reached him to confirm.
iMac, Mac OS X (10.6.4)