Way Too Much Corruption

[Pinkham, Jim]

I have a folder with three versions of a manual (in subfolders) replete
with conditional text, insets, and all the marvels of single sourcing. I
haven't worked on these files for about 6 weeks. This morning all of
them are coming up as corrupt, including the subfolders and the backups.
Any ideas what might be causing this and how to fix it? Your help is
much appreciated.
 
Jim