utility program

n. computer application which performs actions on files

Utility software (also known as service program, service routine, tool, or utility routine) is a type of computer software. It is specifically designed to help manage and tune the computer hardware, operating system  or application software, and perform a single task or a small range of tasks; as opposed to application software which tend to be software suites. Utility software has long been integrated into most major operating systems.
See more at Wikipedia.org...

Noun
1. (computer science) a program designed for general support of the processes of a computer; "a computer system provides utility programs to perform the tasks needed by most users"
(synonym) utility, service program
(hypernym) program, programme, computer program, computer programme
(hyponym) driver, device driver
(part-meronym) utility routine, service routine
(classification) computer science, computing

A computer program that is in general support of the operations and processes of a computer. Note: Examples of utility programs include diagnostic programs, trace programs, input routines, and programs used to perform routine tasks, i.e., perform everyday tasks, such as copying data from one storage location to another. Synonyms service program, service routine, tool, utility routine.