File-extension Definition

noun

A short series of letters and/or numerals at the end of a personal computer filename, used to indicate the type of file and the software that will be required to operate or open it.

A text file will have a file extension of .txt.
Wiktionary

Other Word Forms of File-extension

Noun

Singular:
file-extension
Plural:
file-extensions

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Words Starting With

FFIFIL

Words Ending With

NONION

Unscrambles

file-extension

Words Starting With F and Ending With N

Starts With F & Ends With NStarts With FI & Ends With NStarts With F & Ends With ON

Word Length

14 Letter Words14 Letter Words Starting With F14 Letter Words Ending With N