Filename extension (Filename Extension, or extended file name, suffix name) is a mechanism used by early operating systems (such as VMS/CP/M/DOS, etc.) to mark file formats.
For example: example.txtin the file name, exampleit is the file main name txtand the file extension, indicating that the file is a plain text file, .which is the separator between the file main name and the file extension.
The function of the file extension is to let the system decide which software to run when the user wants to open the file.
File extension not shown
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How to display file extensions in Win 10/11
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资源管理器 - Click
查看 - Click
显示 - Check/uncheck
文件扩展名
