File Extensions: What They Are and Why They Matter | Funifytools

File extensions are the suffixes after a dot that identify a file’s type and which app can open it.

Examples include .docx (Word), .jpg (image), .mp3 (audio), .mp4 (video), .pdf (document), and .exe (program).

Operating systems link extensions to default applications, and you can change these associations as needed.

Enabling “show file name extensions” in Windows makes file management clearer and prevents confusion.

Watching extensions improves security by exposing disguised executables, helping you work more safely and efficiently. 




You can view the original blog post in Korean and English at the links below:

[View in Korean] | [ View in English ]


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