File Extension Type of Computer File Name>プログラミング>情報科学

'英語 English：File extension　
日語 Japanese：ファイル拡張子 (ふぁいるかくちょうし)　
類義 Synonym：Type of file　Part after comma　Part after dot
意味 Meaning：A file extension is a name that specifies the type of file. A computer file is made up of two parts: file name + file extension. A period separates the file name and the file extension.
解説 Commentary：The computer file mydream.txt has two parts: the file name mydream + the file extension .txt.
The computer looks up the file extension to determine how the file should be handled. For example, when it finds the file extension .txt, it thinks, "This is a text file, so I can use Microsoft Word or Memo pad to open it."
有名なファイル拡張子 List of Popular File Extension ：

File extension	Long name	Data
.ai	Adobe Illustrator	Image data
.avi	Audio Video Interleave	Video data
.dat	Data file	General data
.doc	Document file	Text data
.docx	Document file	Text data
.dll	Dynamic-link library	Execution data
.dxf	Drawing Exchange Format	Design data
.dwg	Drawing	Design data
.exe	Executable file	Execution data
.jpg	Joint photographic experts group	Image data
.jpeg	Joint photographic experts group	Image data
.hgt	ー	Map data
.htm	Hypertext markup language	Web data
.html	Hypertext markup language	Web data
.msi	Windows Installer	Microsoft Data
.mov	Quicktime File Format	Video data
.mp3	MPEG-1 Audio Layer III	Audio data
.mp4	MPEG-4 Part 14	Video data
.pdf	Portable Document Format	Image data
.png	Portable Network Graphics	Image data
.ppt	PowerPoint presentation	Text data
.psd	Photoshop Data	Image data
.svg	Scalable Vector Graphics	Image data
.txt	Plain text file	Text data
.wav	Waveform Audio File	Video data
.wave	Waveform Audio File	Video data
.xls	Excel file until 2003	Text data
.xlsm	Excel file from 2007 with macro	Text data
.xlsx	Excel file from 2007	Text data
.zip	Zipped file	Compressed data

語源 Origin：Latin filum (String)　＋　Latin extentionem (Stretching)　⇒　French filer　＋　French estendre　⇒　English file　＋　English extension (Extended portion of something)　⇒　Japanese 拡張子
体系 System：情報科学 (Information science)　＞　プログラミング (Programming)　＞　コンピューター (Computer)　＞　ファイルシステム (File system)　＞　ファイル拡張子 (File extension)
多言語対応 Multilingualism：
韓文 Hanguel：파일 확장자 (pail hwakjangja　발음　파일 확짱자　pail hwakjjangja)
中文 Chinese：繁体 文件擴展名　簡体 文件扩展名　(wénjiànkuòzhǎnmíng　wen2jian4kuo4zhan3ming2)
探究 Further study：

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