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Question about data file folders in Numbers

Update:10-11Source: network consolidation
I have created a Numbers spreadsheet ot create acataluge of my books. The file is simply called Books.numbers.
I now find on my desktop two folders - and The former has sub folders called Data, Index and Metdata. The other has a Metadata dubfolder and several Preview.jpg files.
What are these folders, and do I need to kepp them. Doe sNumbers always create such folders?

The Best Answer

You may have a third party app on your system that automatically expands zIp files. If so, this app could be causing this problem because a Numbers document is in fact a Package file that appears to be a compressed file to some programs.