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					Originally Posted by  ebuecherwurm
					 
				 
				Obvious, but I didn't think of this.    I will check for html-files (the other files are of no relevance yet).  
Hopefully I can recover those files.  
 It's not Sigil, she used the side-by-side Editor (html left, preview right)  
			
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 FTR only - the layouts of both editors are similar, I think these are close to the defaults:
The only reason it may have been be relevant is that there are some long-running issues with Sigil's Book View feature. I can't recall details because I don't use Book View.  The calibre editor doesn't have an equivalent feature in part because of those issues.
If you don't like vi you might like emacs 
BR