.BAK ;General purpose backup extension. .CHK ;Check Disk's files. .BDC ;SmartWare II word processing backups. .BP? ;SmartWare II project processing backups. .BWS ;SmartWare II spreadsheet backup files. .$A? ;Temporary files used in AutoCad. .OLD ;Temporary file name I use. .TMP ;Temporary File Extension. Used in numerous programs. .ERR ;Error file used in Multi-Edit. .MAP ;