Did you ever email the file to anyone?
Have a look in your 'sent' folder
Also, it's best not to edit a file on the thumb drive.
see
How to prevent PowerPoint file corruption
http://office.microsoft.com/en-us/powerpoint/HA011168771033.aspx
see
Recovering a corrupt presentation
http://www.pptfaq.com/FAQ00108.htm
cheers
TAJ Simmons
awesome - powerpoint templates,
http://www.awesomebackgrounds.com
powerpoint backgrounds, free samples, ppt tutorials...
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