Corrupt BEx workbooks - How to recover

Hi experts

I read this blog:

http://scn.sap.com/docs/DOC-49135

Under item 4 the ENTIRE content of this temp-folder should be deleted.

My question: If you only have one corrupt workbook, the rest work fine, wouldn't the deletion of the whole content of this folder that all workbooks get deleted?

How does the mechanism look like?

Where are the workbooks physically stored?

Thanks