Also, on the IE8 'options' tab under general tab there is a 'delete' system for Internet files.
I've been using CC Cleaner every 7-10 days for several years, so I wouldn't have so many if CC Cleaner was the solution. The oldest one is dated 08/17/07. And because CC Cleaner ignores them, I'm reluctant to do anything about them until I know what they are. I've seen these .rdb files when I've done searches for other files, but I didn't know I had so many until I ran a program I found on CNET called WinDirStat that maps the drive showing how much space is occupied by which file types. I have about 88 of them ranging from 2-6500k each, with most of them being from 2000-3000k. The temporary internet files governed by the 'delete' tab under Internet Options are located in the Documents and Settings folder and none of them are .rdb files. The path for these .rdb files is C:\\WINDOWS\Internet Logs.