Message in Chinese (Simplified) (中文(简体))![](/img/flags/zh-Hans.png)
默认的文件扩展名。当用户键入文件名时,如果未指定扩展名,将在文件名后添加此扩展名。
Unlocalized message![](/img/flags/en.png)
The default file name extension. If the user types a file name, this extension is added at the end of the file name if one is not specified.
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