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 # getFileExtension

 Last update: 30.07.2026 

public [getFileExtension](get-file-extension.md)(index: [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)

gets the extension used for the file (used to associate the file with an application).

#### Return

the file extension, e.g. ".xls"

#### Parameters

indexindex in string form, i.e. \[1\]\[2\]\[3\]#### Throws

[ModelCenterException](./../-model-center-exception/index.md)public [getFileExtension](get-file-extension.md)(d1: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)

gets the extension used for the file (used to associate the file with an application).

#### Return

the file extension, e.g. ".xls"

#### Parameters

d1index in the 1st dimension (0-based index)#### Throws

[ModelCenterException](./../-model-center-exception/index.md)public [getFileExtension](get-file-extension.md)(d1: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d2: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)

gets the extension used for the file (used to associate the file with an application).

#### Return

the file extension, e.g. ".xls"

#### Parameters

d1index in the 1st dimension (0-based index)d2index in the 2nd dimension (0-based index)#### Throws

[ModelCenterException](./../-model-center-exception/index.md)public [getFileExtension](get-file-extension.md)(d1: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d2: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d3: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)

public [getFileExtension](get-file-extension.md)(d1: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d2: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d3: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d4: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)

public [getFileExtension](get-file-extension.md)(d1: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d2: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d3: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d4: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d5: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)

public [getFileExtension](get-file-extension.md)(d1: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d2: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d3: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d4: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d5: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d6: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)

public [getFileExtension](get-file-extension.md)(d1: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d2: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d3: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d4: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d5: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d6: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d7: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)

public [getFileExtension](get-file-extension.md)(d1: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d2: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d3: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d4: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d5: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d6: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d7: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d8: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)

public [getFileExtension](get-file-extension.md)(d1: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d2: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d3: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d4: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d5: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d6: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d7: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d8: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d9: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)

public [getFileExtension](get-file-extension.md)(d1: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d2: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d3: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d4: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d5: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d6: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d7: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d8: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d9: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), d10: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)): [String](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html)