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 # setFileExtension

 Last update: 30.07.2026 

public [setFileExtension](set-file-extension.md)(ext: [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html))

sets the desired file extension for the file

#### Parameters

extthe file extension, e.g. ".xls"#### Throws

[ModelCenterException](./../-model-center-exception/index.md)