FYI: I have had to help folks who created presentations in Keynote (and/or Powerpoint) on a Mac try to port them successfully for a presentation on a Windows machine and I either recommend an "export" as .pdf file, which automatically embeds the fonts and their correct placement, or if it has a soundtrack, export as a clickable Quicktime movie, which also embeds the fonts.
There are drawbacks to both, but every Windows machine I've encountered has Acrobat, and many now have Quicktime. Acrobat for WIndows/Mac can be presented at Fullscreen and clicked with the spacebar or arrow keys for forward and back. Unfortunately, transitions are knocked out.
Movies in Quicktime can also be played back at Fullscreen, no space bar, but click and arrow keys, but not "all" transitions will come through, plus the Movie size can become enormous for transport.
Just my 2¢.
---Laura