Each time you use your computer, unwanted files are created that take up increasingly more space on your hard drive. Smart Cleaner erases files with the following extensions: .bak, .~mp, .old, .tmp, .~*, ~*.*, .gid, .fts, .ftg, .da0, .chk, .$db, and .db$. Smart Cleaner also erases file_id.diz, chklist.*, mscreate.dir, and Windows log files. Version 2.2 adds the ability to send files to the recycle bin. This is a 30-day trial. The cost to register is $24.