Exporting trouble...nothing in "Save As Type"!

I am having problems exporting to anything.

The file name pops up and puts an extension .ai on the end, (why??) and there's ZERO file extensions listed in "Save As Type". I have Corel Draw 11. Help! I can't export to anything! I have a Book Cover with photos & text, and have tried other files too, same thing. I need the Book Cover to be turned into a jpg at 300 dpi for the online publisher. Thank you for your help!