---
url: /flow/guide/scripting-reference/functions/file/extractfileext.md
---

# ExtractFileExt

## Declaration

`Function ExtractFileExt( const FileName : string) : string`

### Example

```pascal
procedure OnMapEvent(var Value:Variant);
begin
  Value := ExtractFileExt(Source.FileCon.CurrentFilename);
end;
```

## Description

Returns the file name extension of a file path. The input parameter can either be just a filename or a complete file path.

The extension is considered to be anything that includes and follows the rightmost '.' in a file name. The case of each character is not changed.

Therefore:

* ExtractFileExt('abc.txt') returns '.txt'
* ExtractFileExt('abc') returns '', because no '.' in the file name
* ExtractFileExt('abc.') returns '.'
* ExtractFileExt('abc...') returns '.'
* ExtractFileExt('abc.ref1.txt') returns '.txt'
* ExtractFileExt('abc.TXT') returns '.TXT'