I noticed that one of our servers with low disk space had a lot of security.config.cch files(or security.config.cch.number) in individual user folders, as well as in .Net.Framework config directories.
According to the thread http://www.pcreview.co.uk/forums/thread-1228604.php -it seems they are safe to delete.
But why they are located in config folder, not in some temporary directory, like NET\Framework\{version}\Temporary ASP.NET Files folders?
And they should be suggested for deletion by standard MS windows Disk cleanup utility.
I've submitted this suggestion to MS Connect