Noun
file extension (plural file extensions)
- A short series of text characters at the end of a computer filename, used to indicate the type of contents and the software that will be required to operate or open it.
- A text file may have a file extension of .txt.
- filename extension, filename suffix
- 8.3
- French: extension de fichier
- German: Dateiendung
- Italian: estensione di nome di schedario
- Portuguese: extensão
- Russian: дополне́ние к файлу
- Spanish: extensión de archivo
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