No, I haven't and I do mean this in the most condescending way possible; he's complaining about the proprietary format not working and laments losing his stuff. He could easily solve his problems. It's not a "hack" to open a folder or do you reward yourself with a cookie every time you open a folder on your desktop?
FFS, this is "HackerNews"... write a bash script to do it for you. Better yet, use some "super 1337 h4x0r google-fu" and search "convert keynote 08 to keynote 09" and you'll find a bash script to do it in 5 seconds[1].
[1]: https://www.google.com/search?q=convert+keynote+08+to+keynot...
