This was an erroneous post. I apologize. The named Index.dat files do exist in IE7. However, the subfolders of C:\Documents and Settings\UserName\Local Settings and their files are marked as Hidden and System files in IE7. Why the change from IE6, I don't know. Ccleaner will process the index.dat files in IE7 as it does in IE6.
To view the Hidden system folders and files in Windows Explorer, do the following in the Windows Explorer Tools menu:
Folder Options | View tab | Uncheck "Hide protected operating system files (recommended)" | OK
If you want to see the size of an index.dat file, build a .bat file This is shown for The Temporary Internet Files. The method applies to the other index.dat files as well. The /A:S chars indicate a system file.
@Echo Off
Dir "%UserProFile%\Local Settings\TemporaryInternetFiles\Content.Ie5\Index.dat" /A:S
Pause
Ripoff
The following Version 1.34.407 index.dat files in IE6 do not exist in IE7
C:\Documents and Settings\UserName\Local Settings\Temporary Internet Files\Content.IE5\Index.dat
C:\Documents and Settings\UserName\Local Settings\History\History.IE5\Index.dat
C:\Documents and Settings\UserName\Cookies\Index.dat
Version 1.34.407 has not been updated to deal with IE7 index.dat files.