files gone in windows

Hi,
I have a client which called me up and had files missing. One folder had a bunch of subfolders and the subfolders were still there, but the files were gone. Does anyone know how files could just dissappear. I find it hard to believe it would be anything on my end (the server). Anyone have any ideas on how they could have just dissappeared. I know they use FrontPage.
.j

 

 

 

 

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