main file vs computer file

main file and computer file both are nouns.

Word	Noun	Adjective	Verb	Adverb
main file	Yes	No	No	No
computer file	Yes	No	No	No

As nouns, computer file is a hypernym of main file; that is, computer file is a word with a broader meaning than main file:

main file: (computer science) a computer file that is used as the authority in a given job and that is relatively permanent
computer file: (computer science) a file maintained in computer-readable form

main file (noun)	computer file (noun)
(computer science) a computer file that is used as the authority in a given job and that is relatively permanent	(computer science) a file maintained in computer-readable form