Final answer:
Disk Cleanup is the application that can be used to delete unwanted, compressed, older files, freeing up disk space on a computer's hard drive.
Step-by-step explanation:
The application that can be scheduled to delete unwanted, compressed, older files is Disk Cleanup. Disk Cleanup is a maintenance utility included in Microsoft Windows designed to free up disk space on a computer's hard drive. The utility scans the hard drive for files that are no longer needed such as temporary files, offline web pages, and installer files. It presents a list of these files to the user who can then choose to delete them, potentially freeing up a significant amount of storage space.
By contrast, Disk Defragmenter is used to reorganize the data on a disk so that files are stored in contiguous sections, which can improve system performance. CHKDSK is used to check the integrity of the file system and fix logical file system errors, while Disk Management is a system utility for managing hard disks and the partitions or volumes that they contain.