Can CCleaner be configured to delete all .bak and .wbk files?
by the way bak are backup files, why u want to delete them ? some softwares or files are created in .bak format so that the new file is replace by old and mayne needed later.
Can CCleaner be configured to delete all .bak and .wbk files?
No. You can add individual files in the custom files and folders section but you can't automatically delete all bak files on your computer.