It is often hit and miss using removable media with Word, especially media
where there may be insufficient space available to create temporary files.
If your document cannot be opened by copying it to the hard drive and
opening it from there it is almost certainly corrupt.
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Graham Mayor - Word MVP
Word doesn't create ZIP disks: I assume that you mean you have saved a
document directly to a ZIP disk and now it doesn't open.
You have learnt the hard way never to save a document directly to any form
of removable media. Always save to your local HDD and then copy tot he
removable media. Vice Versa when opening from removable media.