Comment 4 for bug 800298

With reference to my last comment, I have now found which file was repaired. It is likely an old root.disk I had deleted from Ubuntu (after creating a new bigger root.disk).

The strange thing is that Windows 7 did not even show the existence of the folder "found.000" until I had changed the setting in Windows Explorer to not "Hide protected OS files". Even then I couldn't enter the directory except from an Administrator command prompt:
C:\>cd found.000

C:\found.000>dir
 Volume in drive C is OS
 Volume Serial Number is B4B7-99A8

 Directory of C:\found.000

25/06/2011 01:41 PM 15,000,000,000 file0000.chk
               1 File(s) 15,000,000,000 bytes
               0 Dir(s) 207,932,407,808 bytes free

C:\found.000>

So, in my case, it was the intentional deletion of a large file from Ubuntu that (some time later) was detected and recovered by Windows. Not any corruption of the root.disk itself through normal use of Wubi. Which is good.