[Xerte] Importing zip into XOT problem

[Lynch M (LCSS)]

I have Xerte projects which a colleague (now left) had exported and imported into Blackboard (into the content collection) and then pointed to the html file from within a course. All works great.
Now we need to edit the content so I've tried downloading the folder from BB as a zip and importing into my XOT workspace. All works ok except when I attempt to edit there is nothing there.
The downloaded file from BB (when uncompressed) contains;
Folders;
Common
Media
Models
Thumbs

Files;
Index.htm
Learningobject.rlt
MainPreloader.swf
Preview.xml
Resources.swf
rloObject.js
template.xml
template.xwd
XMLEngine.swf

I have tried exporting a working project from our XOT, deleting it and importing and that works so I wonder whether this is to do with the compression?
The zip file size is 6.5MB

Thanks
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