KeyNote files corrupted by Zip-compressing!

I've heard of people getting KeyNote files corrupted so that they are unopenable. I'd never experienced it until I Zip-compressed the file in the finder. Upon uncompressing, the file is corrupt and will NOT open. Yikes!! (Fortunately, I have the original still).
This is serious if it is general. Can anyone else tell me if they see this (and a possible solution to fix a file corrupted in this way).
Info: KeyNote '08 (4.0.3), intel mac. System 10.5.2

I have had that problem, and it happens when the source Keynote file is on an external (firewire) drive. If I copy the file to the root/main drive THEN zip it, it works fine.
....and this happens on multiple Macs and multiple external drives.

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Hi,
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mactreouser wrote:
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