>I'm confident this was not a case of sabotage but I will review exactly what file rights the average user has and tighten that up if needed.

Whoa! I didn't say sabotage! It could easily be a simple mistake! The user that did it may not even be aware of what cause it had. Now that it's done and the effect is evident, they probably don't want to own up now, in any case, especially if you start a witch hunt for a saboteur.

I prefer the user not have create and delete rights. They can create cursors etc in their tmpfiles folder.

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>Peter
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>>They wouldn't need any tools. They'd just have to copy a 25Mb .DBF to that folder. You may want to restrict create and delete file access to that folder.