---
title: "typeFromFileExtension:"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nsdocumentcontroller/typefromfileextension:"
---

# typeFromFileExtension:

Returns the document type associated with files having extension fileExtensionOrHFSFileType.

## Declaration

```occ
- (NSString *) typeFromFileExtension:(NSString *) fileNameExtensionOrHFSFileType;
```

## Discussion

Discussion The  fileExtensionOrHFSFileType parameter may also be an encoded HFS file type, as well as a filename extension. This method only works when passed a file name extension used in a CFBundleDocumentTypes entry that does not have an LSItemContentTypes subentry.

## See Also

### Deprecated Methods

- [documentForFileName:](appkit/nsdocumentcontroller/documentforfilename:.md)
- [fileExtensionsFromType:](appkit/nsdocumentcontroller/fileextensionsfromtype:.md)
- [fileNamesFromRunningOpenPanel](appkit/nsdocumentcontroller/filenamesfromrunningopenpanel.md)
- [makeUntitledDocumentOfType:](appkit/nsdocumentcontroller/makeuntitleddocumentoftype:.md)
- [makeDocumentWithContentsOfURL:ofType:](appkit/nsdocumentcontroller/makedocumentwithcontentsofurl:oftype:.md)
- [makeDocumentWithContentsOfFile:ofType:](appkit/nsdocumentcontroller/makedocumentwithcontentsoffile:oftype:.md)
- [openDocumentWithContentsOfFile:display:](appkit/nsdocumentcontroller/opendocumentwithcontentsoffile:display:.md)
- [openDocumentWithContentsOfURL:display:](appkit/nsdocumentcontroller/opendocumentwithcontentsofurl:display:.md)
- [openDocumentWithContentsOfURL:display:error:](appkit/nsdocumentcontroller/opendocumentwithcontentsofurl:display:error:.md)
- [openUntitledDocumentOfType:display:](appkit/nsdocumentcontroller/openuntitleddocumentoftype:display:.md)
- [reopenDocumentForURL:withContentsOfURL:error:](appkit/nsdocumentcontroller/reopendocumentforurl:withcontentsofurl:error:.md)
- [setShouldCreateUI:](appkit/nsdocumentcontroller/setshouldcreateui:.md)
- [shouldCreateUI](appkit/nsdocumentcontroller/shouldcreateui.md)